Stockholders' Equity (Spin-off) (Details) (USD $) In Millions, except Share data, unless otherwise specified
|
0 Months Ended |
9 Months Ended |
0 Months Ended |
|
Mar. 19, 2014
|
Mar. 31, 2015
|
Mar. 14, 2014
|
Mar. 19, 2014
|
Mar. 17, 2014
|
Class of Stock [Line Items] |
|
|
|
|
|
Exchange ratio based on average closing price for SGI shares |
0.2397amrk_EquityAwardExchangeRatioofFormerParentsAwardstoReplacementAwardsofParent
|
|
|
|
|
Common stock exchange ratio |
|
4.1717amrk_InverseEquityAwardExchangeRatioDenominator
|
|
|
|
SGI (Former Parent) |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Three day weighted average share price before spin-off ( per share) |
|
|
$ 3.32amrk_FormerParentThreeDayAverageSharePricesBeforeSpinoff / dei_LegalEntityAxis = amrk_FormerParentSGIMember
|
|
|
Share price |
14.00us-gaap_SharePrice / dei_LegalEntityAxis = amrk_FormerParentSGIMember
|
|
$ 3.37us-gaap_SharePrice / dei_LegalEntityAxis = amrk_FormerParentSGIMember
|
14.00us-gaap_SharePrice / dei_LegalEntityAxis = amrk_FormerParentSGIMember
|
$ 13.30us-gaap_SharePrice / dei_LegalEntityAxis = amrk_FormerParentSGIMember
|
SGI |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Three day weighted average share price after spin-off ( per share) |
13.85amrk_ParentThreeDayAverageSharePriceAfterSpinoff / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
|
|
Awards assumed from SGI spin-off |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Grants during the period (shares) |
249,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
|
Total compensation cost not yet recognized |
|
0.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
Restricted Stock Units (RSUs) |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Period for recognition of nonvested awards |
|
11 months 22 days
|
|
|
|
Restricted Stock Units (RSUs) | Awards assumed from SGI spin-off |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Grants during the period (shares) |
130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
Total compensation cost not yet recognized, other than options |
|
0.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
Restricted Stock Units (RSUs) | Awards assumed from SGI spin-off | Issued to A-Mark Employees |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Grants during the period (shares) |
50,340us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / dei_LegalEntityAxis = amrk_IssuedtoAMarkEmployeesMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
|
Stock Appreciation Rights (SARs) | Awards assumed from SGI spin-off |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Grants during the period (shares) |
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
Total compensation cost not yet recognized, other than options |
|
0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
Stock Appreciation Rights (SARs) | Awards assumed from SGI spin-off | Issued to A-Mark Employees |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Grants during the period (shares) |
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / dei_LegalEntityAxis = amrk_IssuedtoAMarkEmployeesMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
|
Stock Options |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Period for recognition of nonvested awards |
|
2 years 6 months 26 days
|
|
|
|
Stock Options | Awards assumed from SGI spin-off | Issued to A-Mark Employees |
|
|
|
|
|
Class of Stock [Line Items] |
|
|
|
|
|
Grants during the period (shares) |
216,943us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = amrk_IssuedtoAMarkEmployeesMember / us-gaap_PlanNameAxis = amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
|
|
|
|
|