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Receivables (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
class
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Sep. 30, 2013
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Mar. 31, 2014
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Mar. 31, 2013
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Jun. 30, 2013
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Sep. 27, 2013
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Mar. 31, 2014
Minimum
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Mar. 31, 2014
Maximum
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Jun. 30, 2013
Maximum
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Dec. 31, 2011
A-Mark
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Dec. 30, 2012
A-Mark
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Oct. 31, 2011
A-Mark
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Sep. 27, 2013
Collateral Finance Corporation
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Dec. 31, 2012
Due From M.F. Global, Inc. Trustee
A-Mark
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Mar. 31, 2013
Due From M.F. Global, Inc. Trustee
A-Mark
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Jul. 31, 2012
Due From M.F. Global, Inc. Trustee
A-Mark
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Dec. 31, 2011
Due From M.F. Global, Inc. Trustee
A-Mark
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Jul. 31, 2012
Receivables and Secured Loans, Gross - Trading Operations
A-Mark
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||||||
| Loans receivable average effective rate of interest (percentage) | 8.30% | 8.00% | ||||||||||||||||
| Commodities account segregated balance amount held by broker at bankruptcy | $ 20,300,000 | |||||||||||||||||
| Commodities amount segregated amount returned subsequent to broker bankruptcy | 14,600,000 | |||||||||||||||||
| Commodities account segregated percentage returned subsequent to broker bankruptcy | 72.00% | |||||||||||||||||
| Receivables and secured loans gross | 63,818,000 | 63,818,000 | 94,613,000 | 4,100,000 | 5,700,000 | |||||||||||||
| Proceeds from bankruptcy claims | 1,600,000 | |||||||||||||||||
| Proceeds from sale of other receivables | 3,800,000 | 3,800,000 | ||||||||||||||||
| Allowance for doubtful other receivables, current | 1,000,000 | |||||||||||||||||
| Allowance for doubtful accounts receivable, recoveries | 700,000 | |||||||||||||||||
| Payments to acquire loans receivable | 350,000 | |||||||||||||||||
| Short term loan receivable | 12,800,000 | |||||||||||||||||
| Option to extend maturity | 180 days | |||||||||||||||||
| Repayments of debt | 2,300,000 | 2,300,000 | ||||||||||||||||
| Amortization of debt discount | 100,000 | 100,000 | ||||||||||||||||
| Classes of receivables | 2 | |||||||||||||||||
| Impaired loans | $ 0 | $ 0 | $ 70,000 | |||||||||||||||
| Loans receivable payment terms for interest | 30 days | |||||||||||||||||
| Delinquent period | 30 days | 30 days | ||||||||||||||||
| Loan receivable liquidation period post default | 90 days | 90 days | ||||||||||||||||
| Credit quality indicator loan-to-value threshold percentage | 75.00% | |||||||||||||||||
| Secured loans-to-value percentage | 100.00% | 100.00% | ||||||||||||||||