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Contract Assets (Details) - USD ($)
Mar. 31, 2019
Mar. 31, 2018
Short-term contract assets [Abstract]    
Cores expected to be returned by customers $ 14,671,000 $ 15,614,000
Upfront payments to customers 3,101,000 3,979,000
Core premiums paid to customers 4,411,000 3,613,000
Total short-term contract assets 22,183,000 23,206,000
Long-term contract assets [Abstract]    
Remanufactured cores held at customers' locations 196,914,000 197,067,000
Upfront payments to customers 2,775,000 5,492,000
Core premiums paid to customers 16,618,000 14,603,000
Long-term core inventory deposits 5,569,000 5,569,000
Total long-term contract assets 221,876,000 222,731,000
Total contract assets $ 244,059,000 $ 245,937,000