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Contract Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Contract Assets [Abstract]          
Long-term contract assets, write-down $ 1,687,000 $ 892,000 $ 2,671,000 $ 2,276,000  
Short-term contract assets [Abstract]          
Cores expected to be returned by customers 19,704,000   19,704,000   $ 17,657,000
Upfront payments to customers 577,000   577,000   684,000
Finished goods premiums paid to customers 631,000   631,000   405,000
Core premiums paid to customers 11,417,000   11,417,000   8,194,000
Total short-term contract assets 32,329,000   32,329,000   26,940,000
Long-term contract assets [Abstract]          
Remanufactured cores held at customers' locations 248,902,000   248,902,000   229,918,000
Upfront payments to customers 357,000   357,000   486,000
Finished goods premiums paid to customers 3,062,000   3,062,000   2,731,000
Core premiums paid to customers 48,101,000   48,101,000   31,509,000
Long-term core inventory deposits 5,569,000   5,569,000   5,569,000
Total long-term contract assets $ 305,991,000   $ 305,991,000   $ 270,213,000