Contract Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Contract Assets [Abstract]
Long-term contract assets, write-down	$ 1,995,000	$ 1,269,000	$ 2,773,000	$ 1,841,000
Short-term contract assets [Abstract]
Cores expected to be returned by customers	17,982,000		17,982,000		$ 13,463,000
Core premiums paid to customers	9,669,000		9,669,000		9,812,000
Upfront payments to customers	1,509,000		1,509,000		1,593,000
Finished goods premiums paid to customers	786,000		786,000		575,000
Total short-term contract assets	29,946,000		29,946,000		25,443,000
Long-term contract assets [Abstract]
Remanufactured cores held at customers' locations	269,371,000		269,371,000		271,628,000
Core premiums paid to customers	34,493,000		34,493,000		38,310,000
Long-term core inventory deposits	5,569,000		5,569,000		5,569,000
Finished goods premiums paid to customers	2,604,000		2,604,000		2,530,000
Upfront payments to customers	1,576,000		1,576,000		344,000
Total long-term contract assets	$ 313,613,000		$ 313,613,000		$ 318,381,000