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Contract Assets (Details) - USD ($)
Dec. 31, 2019
Mar. 31, 2019
Short-term contract assets [Abstract]    
Cores expected to be returned by customers $ 14,473,000 $ 14,671,000
Upfront payments to customers 3,254,000 3,101,000
Core premiums paid to customers 4,889,000 4,411,000
Total short-term contract assets 22,616,000 22,183,000
Long-term contract assets [Abstract]    
Remanufactured cores held at customers' locations 202,537,000 196,914,000
Upfront payments to customers 463,000 2,775,000
Core premiums paid to customers 16,000,000 16,618,000
Long-term core inventory deposits 5,569,000 5,569,000
Total long-term contract assets $ 224,569,000 $ 221,876,000