A-Mark Precious Metals, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Customer Concentrations) (Details)

Summary of Significant Accounting Policies (Customer Concentrations) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Concentration Risk [Line Items]
Total revenue	$ 1,624,495,000us-gaap_SalesRevenueGoodsNet	$ 1,581,590,000us-gaap_SalesRevenueGoodsNet	$ 4,616,832,000us-gaap_SalesRevenueGoodsNet	$ 4,566,306,000us-gaap_SalesRevenueGoodsNet
Total accounts receivable, net (excluding secured loans and derivative assets)	55,862,000		55,862,000		39,409,000
Derivative asset	6,390,000us-gaap_DerivativeAssets		6,390,000us-gaap_DerivativeAssets		22,184,000us-gaap_DerivativeAssets
Revenue \| Customer concentrations
Concentration Risk [Line Items]
Total revenue	1,624,495,000	1,581,590,000	4,616,832,000	4,566,306,000
Concentration risk, percentage	100.00%	100.00%		100.00%
Accounts receivable \| Customer concentrations
Concentration Risk [Line Items]
Total accounts receivable, net (excluding secured loans and derivative assets)	55,862,000		55,862,000		39,409,000
Concentration risk, percentage			100.00%		100.00%
Secured loans \| Customer concentrations
Concentration Risk [Line Items]
Total secured loans	46,259,000		46,259,000		41,261,000
Concentration risk, percentage			100.00%		100.00%
HSBC Bank USA \| Revenue \| Customer concentrations
Concentration Risk [Line Items]
Total revenue	481,036,000	454,899,000	1,464,027,000	1,160,592,000
Concentration risk, percentage	29.60%	28.80%	31.70%	25.40%
Veris Gold \| Accounts receivable \| Customer concentrations
Concentration Risk [Line Items]
Total accounts receivable, net (excluding secured loans and derivative assets)	7,516,000		7,516,000		0
Concentration risk, percentage			13.50%	0.00%
Ocean Partners \| Accounts receivable \| Customer concentrations
Concentration Risk [Line Items]
Total accounts receivable, net (excluding secured loans and derivative assets)	23,174,000		23,174,000		0
Concentration risk, percentage			41.50%	0.00%
Royal Canadian Mint \| Accounts receivable \| Customer concentrations
Concentration Risk [Line Items]
Total accounts receivable, net (excluding secured loans and derivative assets)	8,123,000		8,123,000		2,244,000
Concentration risk, percentage			14.50%	5.70%
Customer A \| Secured loans \| Customer concentrations
Concentration Risk [Line Items]
Total secured loans	4,900,000		4,900,000		4,200,000
Concentration risk, percentage			10.60%		10.30%
Customer B \| Secured loans \| Customer concentrations
Concentration Risk [Line Items]
Total secured loans	5,045,000		5,045,000		4,103,000
Concentration risk, percentage			10.90%		9.90%
Customer C \| Secured loans \| Customer concentrations
Concentration Risk [Line Items]
Total secured loans	5,000,000		5,000,000		0
Concentration risk, percentage			10.80%		0.00%
Customer D \| Secured loans \| Customer concentrations
Concentration Risk [Line Items]
Total secured loans	5,622,000		5,622,000		3,771,000
Concentration risk, percentage			12.20%		9.10%
Major Customers \| Revenue \| Customer concentrations
Concentration Risk [Line Items]
Total revenue	481,036,000	454,899,000	1,464,027,000	1,160,592,000
Concentration risk, percentage	29.60%	28.80%	31.70%	25.40%
Major Customers \| Accounts receivable \| Customer concentrations
Concentration Risk [Line Items]
Total accounts receivable, net (excluding secured loans and derivative assets)	38,813,000		38,813,000		2,244,000
Concentration risk, percentage			69.50%		5.70%
Major Customers \| Secured loans \| Customer concentrations
Concentration Risk [Line Items]
Total secured loans	$ 20,567,000		$ 20,567,000		$ 12,074,000
Concentration risk, percentage			44.50%		29.30%