Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | ||||
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Sep. 19, 2014
tranch
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2015
Segment
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Mar. 31, 2014
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Jun. 30, 2014
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Feb. 18, 2014
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Property, Plant and Equipment [Line Items] | |||||||
Number of reportable segments | 1us-gaap_NumberOfReportableSegments | ||||||
Premium on metals position | $ 3,668,000amrk_InventoryPurchasePremiumOnMetalsPositionmarkedtomarket | $ 3,668,000amrk_InventoryPurchasePremiumOnMetalsPositionmarkedtomarket | $ 3,285,000amrk_InventoryPurchasePremiumOnMetalsPositionmarkedtomarket | ||||
Commemorative coin inventory, held at lower of cost or market | 65,000amrk_InventoryCommemorativeCoinStatedAtLowerCostOrMarket | 65,000amrk_InventoryCommemorativeCoinStatedAtLowerCostOrMarket | 2,564,000amrk_InventoryCommemorativeCoinStatedAtLowerCostOrMarket | ||||
Borrowed metals | 6,500,000amrk_BorrowedMetals | 6,500,000amrk_BorrowedMetals | 8,700,000amrk_BorrowedMetals | ||||
Inventories loaned under consignment | 5,600,000us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment | 5,600,000us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment | 11,100,000us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment | ||||
Product under financing arrangement | 48,100,000amrk_ProductUnderFinancingArrangement | 48,100,000amrk_ProductUnderFinancingArrangement | 24,600,000amrk_ProductUnderFinancingArrangement | ||||
Inventory subject to repurchase included in inventory | 43,900,000amrk_InventorySubjecttoRepurchaseAgreement | 43,900,000amrk_InventorySubjecttoRepurchaseAgreement | 27,700,000amrk_InventorySubjecttoRepurchaseAgreement | ||||
Ownership percentage | 2.50%amrk_Noncontrollingownershippercentagecostmethodinvestment | ||||||
Long-term investments | 1,611,000us-gaap_CostMethodInvestments | 1,611,000us-gaap_CostMethodInvestments | 500,000us-gaap_CostMethodInvestments | 500,000us-gaap_CostMethodInvestments | |||
Receivable | 6,163,000us-gaap_DueFromRelatedParties | 6,163,000us-gaap_DueFromRelatedParties | 5,852,000us-gaap_DueFromRelatedParties | ||||
Long-term receivable | 700,000us-gaap_NotesAndLoansReceivableNetNoncurrent | 700,000us-gaap_NotesAndLoansReceivableNetNoncurrent | 0us-gaap_NotesAndLoansReceivableNetNoncurrent | ||||
Payables | 10,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | 10,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | 272,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | ||||
Advertising expense | 200,000us-gaap_AdvertisingExpense | 300,000us-gaap_AdvertisingExpense | 500,000us-gaap_AdvertisingExpense | 600,000us-gaap_AdvertisingExpense | |||
Shipping, handling costs | 1,500,000us-gaap_ShippingHandlingAndTransportationCosts | 1,200,000us-gaap_ShippingHandlingAndTransportationCosts | 4,700,000us-gaap_ShippingHandlingAndTransportationCosts | 4,200,000us-gaap_ShippingHandlingAndTransportationCosts | |||
Number of tranches | 2amrk_NoncontrollingInterestAgreementtoPurchaseCommonStockNumberofTranches | ||||||
Payment for closing of Tranche A | 2,000,000us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates | ||||||
Payments to acquire Tranche A | 1,100,000amrk_PaymentstoAcquireBusinessesandInterestinAffiliatesTranceOne | ||||||
Exclusive supplier agreement, period, Tranche A | 5 years | ||||||
Exclusive supplier agreement, period | 3 years | ||||||
Minimum | |||||||
Property, Plant and Equipment [Line Items] | |||||||
Estimated useful lives of related assets | 3 years | ||||||
Estimated useful lives of intangibles | 4 years | ||||||
Maximum | |||||||
Property, Plant and Equipment [Line Items] | |||||||
Estimated useful lives of related assets | 5 years | ||||||
Estimated useful lives of intangibles | 15 years | ||||||
Common Class A | |||||||
Property, Plant and Equipment [Line Items] | |||||||
Agreement to purchase noncontrolling interest, percentage |
9.00%amrk_CostMethodInvestmentAgreementtoPurchaseCommonStockPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
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Percentage of stock to be purchased for Tranche A |
5.00%amrk_CostMethodInvestmentAgreementtoPurchaseCommonStockFirstTranchePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
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Cost-method Investee | |||||||
Property, Plant and Equipment [Line Items] | |||||||
Receivable |
9,900,000us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
9,900,000us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
2,600,000us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
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Secured loans |
900,000us-gaap_NotesReceivableNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
900,000us-gaap_NotesReceivableNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
0us-gaap_NotesReceivableNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
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Long-term receivable |
700,000us-gaap_NotesAndLoansReceivableNetNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
700,000us-gaap_NotesAndLoansReceivableNetNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
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Payables |
12,900,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
12,900,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
3,500,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
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Revenue from related party |
124,700,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
60,200,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
352,000,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
143,400,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
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Purchases from related party |
$ 300,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
$ 100,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
$ 700,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
$ 2,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amrk_CostmethodInvesteeMember |
X | ||||||||||
- Definition
Borrowed Metals No definition available.
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X | ||||||||||
- Definition
Cost Method Investment, Agreement to Purchase Common Stock, First Tranche, Percentage No definition available.
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X | ||||||||||
- Definition
Noncontrolling Interest, Agreement to Purchase Common Stock, Percentage No definition available.
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X | ||||||||||
- Definition
Cost Method Investment, Exclusive Supplier Agreement, Period, Tranche One No definition available.
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X | ||||||||||
- Definition
Cost Method Investment, Exclusive Supplier Agreement, Period, Tranche Two No definition available.
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X | ||||||||||
- Definition
Inventory, Commemorative Coin, Stated At Lower Cost Or Market No definition available.
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X | ||||||||||
- Definition
Inventory Purchase Premium On Metals Position marked to market No definition available.
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X | ||||||||||
- Definition
Inventory Subject to Repurchase Agreement No definition available.
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X | ||||||||||
- Definition
Noncontrolling Interest, Agreement to Purchase Common Stock, Number of Tranches No definition available.
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X | ||||||||||
- Definition
Non-controlling ownership percentage cost method investment No definition available.
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X | ||||||||||
- Definition
Payments to Acquire Businesses and Interest in Affiliates, Trance One No definition available.
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X | ||||||||||
- Definition
Product under Financing Arrangement No definition available.
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X | ||||||||||
- Definition
Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Carrying amount as of the balance sheet date of obligations due all related parties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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X | ||||||||||
- Definition
An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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X | ||||||||||
- Definition
Gross amount of inventory owned by the entity but in the hands of a customer, typically a reseller. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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X | ||||||||||
- Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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X | ||||||||||
- Definition
Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. No definition available.
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X | ||||||||||
- Definition
Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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