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Inventory (Details) (USD $)
Dec. 31, 2012
Mar. 31, 2012
Non-core inventory [Abstract]    
Raw materials $ 34,772,000 $ 31,560,000
Work in process 577,000 153,000
Finished goods 57,932,000 72,171,000
Non-core inventory, gross 93,281,000 103,884,000
Less allowance for excess and obsolete inventory (7,459,000) (8,813,000)
Total 85,822,000 95,071,000
Inventory unreturned 14,127,000 9,819,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities 41,753,000 47,206,000
Used cores expected to be returned by customers 5,816,000 5,542,000
Remanufactured cores held in finished goods 25,396,000 25,751,000
Remanufactured cores held at customers' locations 91,107,000 118,402,000
Long-term core inventory - gross 164,072,000 196,901,000
Less allowance for excess and obsolete inventory (3,210,000) (2,495,000)
Total 160,862,000 194,406,000
Long-term core inventory deposits $ 27,610,000 $ 26,939,000