Hedging Transactions (Narrative) (Details) (USD $)
|
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Jun. 30, 2014
|
|
Derivative [Line Items] | |||||
Realized gain (loss) on future commodity contracts, net | $ (10,309,000)us-gaap_DerivativeGainLossOnDerivativeNet | $ (21,122,000)us-gaap_DerivativeGainLossOnDerivativeNet | $ (44,831,000)us-gaap_DerivativeGainLossOnDerivativeNet | $ (31,144,000)us-gaap_DerivativeGainLossOnDerivativeNet | |
Derivative usual settlement period | 2 days | ||||
Derivative open positions expected settlement period | 30 days | ||||
Unrealized losses on foreign exchange | (123,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (60,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (207,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 0us-gaap_ForeignCurrencyTransactionGainLossUnrealized | |
Foreign Exchange | |||||
Derivative [Line Items] | |||||
Open inventory sale commitments |
300,000amrk_OpenInventorySaleandPurchaseCommitmentsnet / amrk_CommitmentTypeAxis = us-gaap_ForeignExchangeMember |
300,000amrk_OpenInventorySaleandPurchaseCommitmentsnet / amrk_CommitmentTypeAxis = us-gaap_ForeignExchangeMember |
2,700,000amrk_OpenInventorySaleandPurchaseCommitmentsnet / amrk_CommitmentTypeAxis = us-gaap_ForeignExchangeMember |
||
Forward contracts | |||||
Derivative [Line Items] | |||||
Open inventory sale commitments |
$ 2,200,000amrk_OpenInventorySaleandPurchaseCommitmentsnet / amrk_CommitmentTypeAxis = us-gaap_ForwardContractsMember |
$ 2,200,000amrk_OpenInventorySaleandPurchaseCommitmentsnet / amrk_CommitmentTypeAxis = us-gaap_ForwardContractsMember |
$ 3,800,000amrk_OpenInventorySaleandPurchaseCommitmentsnet / amrk_CommitmentTypeAxis = us-gaap_ForwardContractsMember |
X | ||||||||||
- Definition
Derivative Customary Settlement Period No definition available.
|
X | ||||||||||
- Definition
Derivative Open Position Expected Settlement Period No definition available.
|
X | ||||||||||
- Definition
Open Inventory Sale and Purchase Commitments, net No definition available.
|
X | ||||||||||
- Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Details
|
X | ||||||||||
- Definition
Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|