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Inventory (Details) (USD $) | Dec. 31, 2013 | Mar. 31, 2013 | May 31, 2013 Fenco [Member]
--- | --- | --- | ---
Non-core inventory [Abstract] |  |  |
Raw materials | $ 14,985,000 | $ 14,152,000 |
Work-in-process | 94,000 | 137,000 |
Finished goods | 29,845,000 | 19,239,000 |
Non-core inventory, gross | 44,924,000 | 33,528,000 |
Less allowance for excess and obsolete inventory | (1,704,000) | (1,690,000) |
Total | 43,220,000 | 31,838,000 |
Inventory unreturned | 7,199,000 | 6,981,000 |
Long-term core inventory [Abstract] |  |  |
Used cores held at the Company's facilities | 24,460,000 | 22,227,000 |
Used cores expected to be returned by customers | 7,075,000 | 5,147,000 |
Remanufactured cores held in finished goods | 16,965,000 | 15,019,000 |
Remanufactured cores held at customers' locations | 87,138,000 | 76,626,000 |
Long-term core inventory - gross | 135,638,000 | 119,019,000 |
Less allowance for excess and obsolete inventory | (1,121,000) | (808,000) |
Total | 134,517,000 | 118,211,000 |
Long-term core inventory deposits | 28,857,000 | 27,610,000 |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Non-core inventory, deconsolidated |  |  | 25,731,000
Disposal Group, Including Discontinued Operation, Inventory Unreturned |  |  | 5,321,000
Disposal Group, Including Discontinued Operation, Long-term Core Inventory, Net |  |  | $ 40,471,000

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