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

Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Narrative) (Details)

Financing Agreements (Narrative) (Details) (USD $)	3 Months Ended						3 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended
Financing Agreements (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Sep. 12, 2014 Sixth Participant Line of credit	Sep. 30, 2014 Trading credit facility	Jun. 30, 2014 Trading credit facility	Sep. 30, 2014 Trading credit facility Line of credit	Sep. 30, 2013 Trading credit facility Line of credit	Sep. 12, 2014 Trading credit facility A-Mark Line of credit	Sep. 30, 2014 Trading credit facility A-Mark Line of credit	Jun. 30, 2014 Trading credit facility A-Mark Line of credit	Sep. 30, 2014 Trading credit facility Certain lender common to SNI and A-Mark A-Mark Line of credit	Sep. 30, 2014 Trading credit facility Certain lender common to SNI and A-Mark SNI and A-Mark Line of credit	Mar. 31, 2014 Trading credit facility Certain lender common to SNI and A-Mark SNI and A-Mark Line of credit	Mar. 31, 2014 Trading credit facility Certain lender common to SNI and A-Mark SNI Line of credit	Sep. 30, 2014 Collectibles credit facility Certain lender common to SNI and A-Mark SNI Line of credit
Schedule Of Financing Arrangements [Line Items]
Line of credit, maximum borrowing capacity				$ 50,000,000.0						$ 220,000,000		$ 20,000,000		$ 23,000,000	$ 5,000,000
Variable rate basis										one-month LIBOR
Credit facility, interest rate at period end										0.15%	0.15%
Borrowings due on demand										128,000,000	135,200,000
Letters of credit outstanding					0	0
Credit facility, remaining borrowing capacity										34,700,000	14,400,000					2,000,000
Credit facility, minimum required tangible net worth									35,000,000		25,000,000
Tangible net worth										42,400,000
Line of credit	128,000,000		135,200,000									18,000,000	21,000,000			3,000,000
Interest expense, notes payable							900,000	800,000
Percentage of total expense recognized	87.80%	82.50%
Effective rate of interest	3.06%	3.19%
Liability on borrowed metals	11,998,000		8,709,000
Product financing obligation	$ 20,613,000		$ 24,610,000