Assets and Liabilities, at Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Financial assets:
Derivative assets	$ 17,587	$ 33,732
Financial liabilities:
Liability on borrowed metals	5,625	4,352
Product financing arrangements	135,343	59,358
Derivative liabilities	34,582	36,454
Accrued liabilities	4,945	7,660
Carrying Amount
Financial assets:
Cash	13,059	17,142
Receivables, net	39,295	43,302
Secured loans receivable	91,238	70,504
Income tax receivables	0	7,318
Financial liabilities:
Lines of credit	180,000	212,000
Liability on borrowed metals	5,625	4,352
Product financing arrangements	135,343	59,358
Accounts payable	41,947	46,769
Accrued liabilities	4,945	7,660
Other long-term liabilities	1,117	0
Income taxes payable	1,418	0
Note payable - related party	500	0
Fair value
Financial assets:
Cash	13,059	17,142
Receivables, net	39,295	43,302
Secured loans receivable	91,238	70,504
Income tax receivables	0	7,318
Financial liabilities:
Lines of credit	180,000	212,000
Liability on borrowed metals	5,625	4,352
Product financing arrangements	135,343	59,358
Accounts payable	41,947	46,769
Accrued liabilities	4,945	7,660
Other long-term liabilities	1,117	0
Income taxes payable	1,418	0
Note payable - related party	500	0
Open sale and purchase commitments | Carrying Amount
Financial liabilities:
Derivative liabilities	29,785	1,919
Open sale and purchase commitments | Fair value
Financial liabilities:
Derivative liabilities	29,785	1,919
Liability on margin accounts | Carrying Amount
Financial liabilities:
Derivative liabilities	4,797	8,182
Liability on margin accounts | Fair value
Financial liabilities:
Derivative liabilities	4,797	8,182
Future contracts | Carrying Amount
Financial liabilities:
Derivative liabilities	0	13,914
Future contracts | Fair value
Financial liabilities:
Derivative liabilities	0	13,914
Forward contracts | Carrying Amount
Financial liabilities:
Derivative liabilities	0	12,439
Forward contracts | Fair value
Financial liabilities:
Derivative liabilities	0	12,439
Open sale and purchase commitments | Carrying Amount
Financial assets:
Derivative assets	931	32,347
Open sale and purchase commitments | Fair value
Financial assets:
Derivative assets	931	32,347
Future contracts | Carrying Amount
Financial assets:
Derivative assets	1,273	0
Future contracts | Fair value
Financial assets:
Derivative assets	1,273	0
Forward contracts | Carrying Amount
Financial assets:
Derivative assets	15,383	1,385
Forward contracts | Fair value
Financial assets:
Derivative assets	15,383	1,385
Former Parent | Carrying Amount
Financial assets:
Income tax receivables	0	203
Former Parent | Fair value
Financial assets:
Income tax receivables	$ 0	$ 203