Transactions with Affiliates - Related Party Transactions (Details) - Related Party - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Transactions with Affiliates
Accounts receivable-affiliates	$ 1,501	$ 12,362
Accounts payable-affiliates	37	65
Equity method investees
Transactions with Affiliates
Purchases from related party	1,281	1,872	$ 1,091
Accounts receivable-affiliates	1,501	673
Accounts payable-affiliates	36	64
Entities affiliated with management
Transactions with Affiliates
Purchases from related party	100	0	$ 1,489
Accounts receivable-affiliates	0	1
Accounts payable-affiliates	1	1
NGL Energy Holdings LLC (1)
Transactions with Affiliates
Accounts receivable-affiliates	$ 0	$ 11,688