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Contract Assets (Details) - USD ($)
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Contract Assets [Abstract]    
Long-term contract assets, write-down $ 4,671,000 $ 4,600,000
Short-term contract assets [Abstract]    
Cores expected to be returned by customers 15,778,000 17,657,000
Upfront payments to customers 517,000 684,000
Finished goods premiums paid to customers 584,000 405,000
Core premiums paid to customers 10,621,000 8,194,000
Total short-term contract assets 27,500,000 26,940,000
Long-term contract assets [Abstract]    
Remanufactured cores held at customers' locations 258,376,000 229,918,000
Upfront payments to customers 210,000 486,000
Finished goods premiums paid to customers 2,806,000 2,731,000
Core premiums paid to customers 43,294,000 31,509,000
Long-term core inventory deposits 5,569,000 5,569,000
Total long-term contract assets $ 310,255,000 $ 270,213,000