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Contract Assets (Details) - USD ($)
Sep. 30, 2019
Mar. 31, 2019
Short-term contract assets [Abstract]    
Cores expected to be returned by customers $ 11,776,000 $ 14,671,000
Upfront payments to customers 3,312,000 3,101,000
Core premiums paid to customers 4,383,000 4,411,000
Total short-term contract assets 19,471,000 22,183,000
Long-term contract assets [Abstract]    
Remanufactured cores held at customers' locations 203,024,000 196,914,000
Upfront payments to customers 1,234,000 2,775,000
Core premiums paid to customers 14,502,000 16,618,000
Long-term core inventory deposits 5,569,000 5,569,000
Total long-term contract assets $ 224,329,000 $ 221,876,000