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Inventory (Details) (USD $)
Jun. 30, 2014
Mar. 31, 2014
Non-core inventory [Abstract]    
Raw materials $ 18,084,000 $ 18,787,000
Work-in-process 239,000 124,000
Finished goods 30,902,000 30,197,000
Non-core inventory, gross 49,225,000 49,108,000
Less allowance for excess and obsolete inventory (1,754,000) (1,862,000)
Total 47,471,000 47,246,000
Inventory unreturned 7,328,000 7,534,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities 25,142,000 23,718,000
Used cores expected to be returned by customers 5,857,000 6,160,000
Remanufactured cores held in finished goods 20,139,000 18,093,000
Remanufactured cores held at customers' locations 98,936,000 96,351,000
Long-term core inventory - gross 150,074,000 144,322,000
Less allowance for excess and obsolete inventory (654,000) (846,000)
Total 149,420,000 143,476,000
Long-term core inventory deposits $ 29,638,000 $ 29,375,000