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Contract Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Contract Assets [Abstract]      
Long-term contract assets, write-down $ 892,000 $ 2,276,000  
Short-term contract assets [Abstract]      
Cores expected to be returned by customers 26,021,000   $ 12,579,000
Upfront payments to customers 1,618,000   2,865,000
Core premiums paid to customers 5,670,000   4,888,000
Total short-term contract assets 33,309,000   20,332,000
Long-term contract assets [Abstract]      
Remanufactured cores held at customers' locations 209,366,000   217,616,000
Upfront payments to customers 435,000   589,000
Core premiums paid to customers 19,220,000   15,766,000
Long-term core inventory deposits 5,569,000   5,569,000
Total long-term contract assets $ 234,590,000   $ 239,540,000