Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies Fair Value Measurement, Recurring and Nonrecurring (Details)

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Summary of Significant Accounting Policies Fair Value Measurement, Recurring and Nonrecurring (Details) (Fair Value on a Recurring Basis, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jun. 30, 2013
Active Markets for Identical Instruments (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory $ 160,029 $ 162,378
Total assets valued at fair value 179,176 177,816
Liability on borrowed metals (11,226) (20,117)
Obligation under product financing arrangement 25,506 (38,554)
Liability on margin accounts (6,469) (6,636)
Total liabilities, valued at fair value (75,238) (95,499)
Active Markets for Identical Instruments (Level 1) | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 10 30,192
Active Markets for Identical Instruments (Level 1) | Open sales and purchase commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities (32,027)  
Active Markets for Identical Instruments (Level 1) | Derivative Asset Open Purchases And Sales Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 3,293 14,967
Active Markets for Identical Instruments (Level 1) | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4,933  
Active Markets for Identical Instruments (Level 1) | Precious metals futures contracts at market values
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 10,921 471
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 0 0
Total assets valued at fair value 0 0
Liability on borrowed metals 0 0
Obligation under product financing arrangement 0 0
Liability on margin accounts 0 0
Total liabilities, valued at fair value 0 0
Significant Other Observable Inputs (Level 2) | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2) | Open sales and purchase commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Significant Other Observable Inputs (Level 2) | Derivative Asset Open Purchases And Sales Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Significant Other Observable Inputs (Level 2) | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Significant Other Observable Inputs (Level 2) | Precious metals futures contracts at market values
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 0 0
Total assets valued at fair value 0 0
Liability on borrowed metals 0 0
Obligation under product financing arrangement 0 0
Liability on margin accounts 0 0
Total liabilities, valued at fair value 0 0
Significant Unobservable Inputs (Level 3) | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Open sales and purchase commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Significant Unobservable Inputs (Level 3) | Derivative Asset Open Purchases And Sales Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Significant Unobservable Inputs (Level 3) | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Significant Unobservable Inputs (Level 3) | Precious metals futures contracts at market values
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Total Balance
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory 160,029 162,378
Total assets valued at fair value 179,176 177,816
Liability on borrowed metals (11,226) (20,117)
Obligation under product financing arrangement (25,506) (38,554)
Liability on margin accounts (6,469) (6,636)
Total liabilities, valued at fair value (75,238) (95,499)
Total Balance | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 10 30,192
Total Balance | Open sales and purchase commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities (32,027)  
Total Balance | Derivative Asset Open Purchases And Sales Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 3,293 14,967
Total Balance | Forward Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4,933  
Total Balance | Precious metals futures contracts at market values
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 10,921 $ 471