Description of Business (Details) (USD $)
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0 Months Ended |
9 Months Ended |
0 Months Ended |
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Mar. 14, 2014
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Mar. 14, 2014
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Mar. 31, 2015
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Mar. 19, 2014
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Mar. 19, 2014
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Jun. 30, 2014
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Mar. 17, 2014
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Feb. 12, 2014
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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Common stock, par value (usd per share) |
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$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
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$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
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$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
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Common stock, shares outstanding |
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6,962,742us-gaap_CommonStockSharesOutstanding
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6,962,742us-gaap_CommonStockSharesOutstanding
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7,402,664us-gaap_CommonStockSharesOutstanding
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Cancellation of shares by Former Parent, shares |
71,922amrk_StockCanceledDuringPeriodShares
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71,922amrk_StockCanceledDuringPeriodShares
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Common stock exchange ratio, numerator |
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1amrk_EquityAwardExchangeRatioNumerator
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Common stock exchange ratio, denominator |
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4.1717amrk_InverseEquityAwardExchangeRatioDenominator
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Awards assumed from SGI spin-off |
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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Grants during the period (shares) |
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249,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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Awards assumed from SGI spin-off | Restricted Stock Units (RSUs) |
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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Grants during the period (shares) |
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130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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Awards assumed from SGI spin-off | Stock Appreciation Rights (SARs) |
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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Grants during the period (shares) |
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8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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Former Parent SGI Plans |
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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Secondment fee payable |
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$ 150,000us-gaap_OtherCommitment / amrk_AnnualFeeDueforServiceCommitmentAxis = amrk_FormerParentSGIPlansMember
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