Hedging Transactions (Offsetting Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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Jun. 30, 2014
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Offsetting Assets and Liabilities [Line Items] | ||
Gross derivative receivable | $ 18,627us-gaap_DerivativeFairValueOfDerivativeAsset | $ 26,296us-gaap_DerivativeFairValueOfDerivativeAsset |
Amounts netted | (12,237)us-gaap_DerivativeAssetFairValueGrossLiability | (4,112)us-gaap_DerivativeAssetFairValueGrossLiability |
Net derivative receivable | 6,390us-gaap_DerivativeAssets | 22,184us-gaap_DerivativeAssets |
Gross derivative payable | 17,938us-gaap_DerivativeFairValueOfDerivativeLiability | 16,525us-gaap_DerivativeFairValueOfDerivativeLiability |
Amounts netted | (1,557)us-gaap_DerivativeLiabilityFairValueGrossAsset | (174)us-gaap_DerivativeLiabilityFairValueGrossAsset |
Cash collateral pledge | (3,876)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset | 16,431us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset |
Net derivative payables | 12,505us-gaap_DerivativeLiabilities | 32,782us-gaap_DerivativeLiabilities |
Open sales and purchase commitments | ||
Offsetting Assets and Liabilities [Line Items] | ||
Gross derivative receivable |
9,482us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
26,282us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Amounts netted |
(5,102)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
(4,112)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Net derivative receivable |
4,380us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
22,170us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Gross derivative payable |
1,322us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
1,022us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Amounts netted |
(762)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
(174)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Cash collateral pledge |
0us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
0us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Net derivative payables |
560us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
848us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrk_OpenPurchasesAndSalesCommitmentsMember |
Margin accounts | ||
Offsetting Assets and Liabilities [Line Items] | ||
Gross derivative payable |
10,870us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
15,751us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
Amounts netted |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
Cash collateral pledge |
(3,876)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
(6,768)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
Net derivative payables |
6,994us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
8,983us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = amrk_DerivativeLiabilityMarginAccountsMember |
Future contracts | ||
Offsetting Assets and Liabilities [Line Items] | ||
Gross derivative receivable |
9,145us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
Amounts netted |
(7,135)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
Net derivative receivable |
2,010us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
0us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
Gross derivative payable |
0us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
(15,121)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
Amounts netted |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
Cash collateral pledge |
23,199us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
|
Net derivative payables |
0us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
8,078us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember |
Forward contracts | ||
Offsetting Assets and Liabilities [Line Items] | ||
Gross derivative receivable |
0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
14us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Amounts netted |
0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Net derivative receivable |
0us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
14us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Gross derivative payable |
5,746us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
14,873us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Amounts netted |
(795)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Cash collateral pledge |
0us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
0us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Net derivative payables |
$ 4,951us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
$ 14,873us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
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- Definition
Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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