Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.8
Summary of Significant Accounting Policies (Customer Concentrations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Mar. 31, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Concentration Risk [Line Items]                      
Total revenue $ 1,413,048 $ 1,581,590 $ 1,488,691 $ 1,496,025 $ 2,097,639 $ 1,696,783 $ 1,619,815 $ 1,833,480 $ 5,979,354 $ 7,247,717 $ 7,782,340
Total accounts receivable, net (excluding secured loans and derivative assets) 39,409       59,028       39,409 59,028  
Total secured loans 41,261       35,585       41,261 35,585  
Derivative asset 22,200       15,400       22,200 15,400  
Revenue | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total revenue                 5,979,354 7,247,717 7,782,340
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) 39,409       59,028       39,409 59,028  
Concentration risk, percentage                 100.00% 100.00%  
Secured loans | Customer concentrations
                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 100.00% 100.00%  
Royal Canadian Mint | Revenue | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total revenue                 372,233 823,756 434,795
Concentration risk, percentage                 6.20% 11.40% 5.60%
Royal Canadian Mint | Accounts receivable | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total accounts receivable, net (excluding secured loans and derivative assets) 2,244       8,593       2,244 8,593  
Concentration risk, percentage                 5.70% 14.60%  
HSBC Bank USA | Revenue | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total revenue                 1,547,631 814,207 1,796,016
Concentration risk, percentage                 25.90% 11.20% 23.10%
Johnson Matthey | Revenue | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total revenue                 107,344 778,151 1,305,877
Concentration risk, percentage                 1.80% 10.70% 16.80%
United States Mint | Accounts receivable | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total accounts receivable, net (excluding secured loans and derivative assets) 0       44,185       0 44,185  
Concentration risk, percentage                 0.00% 74.90%  
Customer A | Secured loans | Customer concentrations
                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 9.10% 44.40%  
Total secured loans 3,771       15,800       3,771 15,800  
Customer B | Secured loans | Customer concentrations
                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 5.70% 10.20%  
Total secured loans 2,346       3,659       2,346 3,659  
Customer C | Secured loans | Customer concentrations
                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 10.20% 7.60%  
Total secured loans 4,200       2,700       4,200 2,700  
Customer D | Secured loans | Customer concentrations
                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 9.90% 4.90%  
Total secured loans 4,103       1,726       4,103 1,726  
Major Customers | Revenue | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total revenue                 2,027,208 2,416,114 3,536,688
Concentration risk, percentage                 33.90% 33.30% 45.40%
Major Customers | Accounts receivable | Customer concentrations
                      
Concentration Risk [Line Items]                      
Total accounts receivable, net (excluding secured loans and derivative assets) 2,244       52,778       2,244 52,778  
Concentration risk, percentage                 5.70% 89.50%  
Major Customers | Secured loans | Customer concentrations
                      
Concentration Risk [Line Items]                      
Concentration risk, percentage                 34.90% 67.10%  
Total secured loans 14,420       23,885       14,420 23,885  
Secured loans
                      
Concentration Risk [Line Items]                      
Total secured loans $ 41,261       $ 35,585       $ 41,261 $ 35,585