Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Liability on Borrowed Metals - Additional Information (Details)

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Financing Agreements - Liability on Borrowed Metals - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Liabilities On Borrowed Metals [Line Items]    
Liabilities on borrowed metals $ 178,604 $ 201,144
Precious Metals Held Under Financing Arrangements    
Liabilities On Borrowed Metals [Line Items]    
Borrowed precious metals from suppliers 159,800 179,300
Inventories    
Liabilities On Borrowed Metals [Line Items]    
Borrowed precious metals from suppliers $ 18,800 $ 21,800