Contract Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Contract Assets [Abstract]
Long-term contract assets, write-down	$ 846,000	$ 1,304,000	$ 3,517,000	$ 3,580,000
Short-term contract assets [Abstract]
Cores expected to be returned by customers	14,172,000		14,172,000		$ 17,657,000
Upfront payments to customers	540,000		540,000		684,000
Finished goods premiums paid to customers	613,000		613,000		405,000
Core premiums paid to customers	11,284,000		11,284,000		8,194,000
Total short-term contract assets	26,609,000		26,609,000		26,940,000
Long-term contract assets [Abstract]
Remanufactured cores held at customers' locations	257,609,000		257,609,000		229,918,000
Upfront payments to customers	231,000		231,000		486,000
Finished goods premiums paid to customers	2,926,000		2,926,000		2,731,000
Core premiums paid to customers	45,421,000		45,421,000		31,509,000
Long-term core inventory deposits	5,569,000		5,569,000		5,569,000
Total long-term contract assets	$ 311,756,000		$ 311,756,000		$ 270,213,000