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Contract Assets (Details) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Short-term contract assets [Abstract]    
Cores expected to be returned by customers $ 13,410,000 $ 14,671,000
Upfront payments to customers 3,106,000 3,101,000
Core premiums paid to customers 4,397,000 4,411,000
Total short-term contract assets 20,913,000 22,183,000
Long-term contract assets [Abstract]    
Remanufactured cores held at customers' locations 189,505,000 196,914,000
Upfront payments to customers 2,007,000 2,775,000
Core premiums paid to customers 15,557,000 16,618,000
Long-term core inventory deposits 5,569,000 5,569,000
Total long-term contract assets 212,638,000 221,876,000
Total contract assets $ 233,551,000 $ 244,059,000