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

Income Taxes (Reconciliation) (Details)	3 Months Ended		9 Months Ended
Income Taxes (Reconciliation) (Details)	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	42.80%	9.50%	38.90%	31.70%