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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 9 Months Ended | ||||||
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Mar. 31, 2014
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Dec. 31, 2013
Segment
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2014
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Mar. 31, 2013
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Jun. 30, 2013
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| Significant Accounting Policies Other Details [Line Items] | |||||||||
| Number of reportable segments | 1 | ||||||||
| Inventory Purchase Premium On Metals Position | $ 3,336,000 | $ 3,336,000 | $ 1,787,000 | ||||||
| Borrowed metals | 11,200,000 | 11,200,000 | 20,100,000 | ||||||
| Inventories loaned under consignment | 5,400,000 | 5,400,000 | 2,600,000 | ||||||
| Product under Financing Arrangement | 25,500,000 | 25,500,000 | 38,600,000 | ||||||
| Advertising costs | 200,000 | 100,000 | 300,000 | 300,000 | |||||
| Shipping and handling costs | 1,300,000 | 800,000 | 3,000,000 | 1,800,000 | |||||
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Futures commodity, forwards contracts, pen purchase and sale commitments
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| Significant Accounting Policies Other Details [Line Items] | |||||||||
| Gain (loss) on derivative | 14,000,000 | (80,900,000) | (1,800,000) | (39,900,000) | |||||
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Commodity contract
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| Significant Accounting Policies Other Details [Line Items] | |||||||||
| Gain (loss) on derivative | $ (6,500,000) | $ 52,500,000 | $ (8,200,000) | $ 31,800,000 | |||||