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Inventory (Details) - USD ($) | Mar. 31, 2016 | Mar. 31, 2015
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Non-core inventory [Abstract] |  |  |
Raw materials |  | $ 17,394,000 | $ 18,836,000
Work-in-process |  | 135,000 | 255,000
Finished goods |  | 42,982,000 | 39,828,000
Non-core inventory, gross |  | 60,511,000 | 58,919,000
Less allowance for excess and obsolete inventory |  | (2,451,000) | (2,090,000)
Total |  | 58,060,000 | 56,829,000
Inventory unreturned |  | 10,520,000 | 7,833,000
Long-term core inventory [Abstract] |  |  |
Used cores held at the Company's facilities |  | 34,405,000 | 27,417,000
Used cores expected to be returned by customers |  | 10,781,000 | 9,799,000
Remanufactured cores held in finished goods |  | 24,489,000 | 21,557,000
Remanufactured cores held at customers' locations | [1] | 172,600,000 | 130,762,000
Long-term core inventory - gross |  | 242,275,000 | 189,535,000
Less allowance for excess and obsolete inventory |  | (1,175,000) | (585,000)
Total |  | 241,100,000 | 188,950,000
Long-term core inventory deposit |  | 5,569,000 | 31,571,000
Long-term core inventory deposits transferred |  | $ 25,805,000 |
Remanufactured cores included in long-term core inventory deposits |  |  | $ 26,002,000
[1] | During the year ended March 31, 2016, the Company completed the core buy-back program with one of its largest customers. As a result of the completion of this buy-back program and related long-term core inventory reconciliations, $25,805,000 from long-term core inventory deposits was transferred to Remanufactured Cores held at customers' locations within long-term core inventory. At March 31, 2015, $26,002,000 of remanufactured cores in connection with this core buy-back program was included in long-term core inventory deposits.

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- Definition Amount transferred from the long-term core inventory deposits account to the remanufactured cores held at customers' location account within the long-term core inventory. + References No definition available. + Details
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- Definition Gross amount (lower of cost or market) as of the balance sheet date of (1) used cores held in inventory at Company facilities, (2) used cores expected to be returned by the Company's customers, (3) remanufactured cores held in finished goods at Company facilities, and (4) remanufactured cores held at customers locations. + References No definition available. + Details
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- Definition Carrying amount (lower of cost or market) of remanufactured cores the Company has purchased from its customers, which are held by the customers and remain on the customers' premises. + References No definition available. + Details
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- Definition Carrying amount (lower of cost or market) as of the balance sheet date of (1) used cores held in inventory at Company facilities, (2) used cores expected to be returned by the Company's customers, (3) remanufactured cores held in finished goods at Company facilities, and (4) remanufactured cores held at customers locations, less all valuation and other allowances. + References No definition available. + Details
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- Definition Amount of remanufactured cores included in long-term core inventory deposits in connection with the core buy-back program. + References No definition available. + Details
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