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Inventory (Details) - USD ($)
Dec. 31, 2017
Mar. 31, 2017
Non-core inventory [Abstract]    
Raw materials $ 26,773,000 $ 21,515,000
Work-in-process 1,548,000 641,000
Finished goods 56,530,000 48,337,000
Non-core inventory, gross 84,851,000 70,493,000
Less allowance for excess and obsolete inventory (3,860,000) (2,977,000)
Total 80,991,000 67,516,000
Inventory unreturned 7,249,000 7,581,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities 52,804,000 38,713,000
Used cores expected to be returned by customers 12,637,000 11,752,000
Remanufactured cores held in finished goods 34,421,000 27,667,000
Remanufactured cores held at customers' locations [1] 198,794,000 185,938,000
Long-term core inventory - gross 298,656,000 264,070,000
Less allowance for excess and obsolete inventory (2,382,000) (1,148,000)
Total 296,274,000 262,922,000
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.