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Inventory (Details) - USD ($)
Sep. 30, 2015
Mar. 31, 2015
Non-core inventory [Abstract]    
Raw materials $ 17,407,000 $ 18,836,000
Work-in-process 557,000 255,000
Finished goods 38,200,000 39,828,000
Non-core inventory, gross 56,164,000 58,919,000
Less allowance for excess and obsolete inventory (2,191,000) (2,090,000)
Total 53,973,000 56,829,000
Inventory unreturned 10,641,000 7,833,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities 38,044,000 27,417,000
Used cores expected to be returned by customers 10,382,000 9,799,000
Remanufactured cores held in finished goods 19,881,000 21,557,000
Remanufactured cores held at customers' locations [1] 164,313,000 130,762,000
Long-term core inventory - gross 232,620,000 189,535,000
Less allowance for excess and obsolete inventory (1,238,000) (585,000)
Total 231,382,000 188,950,000
Long-term core inventory deposits [1] 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 three months ended September 30, 2015, 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 the long-term core inventory deposits account was transferred to the remanufactured cores held at customers' locations account 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.