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Inventory (Details) - USD ($)
Mar. 31, 2016
Mar. 31, 2015
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.