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Inventory (Details) - USD ($)
Dec. 31, 2016
Mar. 31, 2016
Non-core inventory [Abstract]    
Raw materials $ 23,074,000 $ 17,394,000
Work-in-process 581,000 135,000
Finished goods 50,556,000 42,982,000
Non-core inventory, gross 74,211,000 60,511,000
Less allowance for excess and obsolete inventory (2,871,000) (2,451,000)
Total 71,340,000 58,060,000
Inventory unreturned 5,098,000 10,520,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities 42,036,000 34,405,000
Used cores expected to be returned by customers 12,104,000 10,781,000
Remanufactured cores held in finished goods 25,671,000 24,489,000
Remanufactured cores held at customers' locations [1] 178,607,000 172,600,000
Long-term core inventory - gross 258,418,000 242,275,000
Less allowance for excess and obsolete inventory (1,220,000) (1,175,000)
Total 257,198,000 241,100,000
Long-term core inventory deposits $ 5,569,000 $ 5,569,000
[1] Remanufactured cores held at customers' locations represent the core portion of the Company's customers' finished goods at the Company's customers' locations.