Goodwill (Details) $ in Thousands		12 Months Ended
	Jul. 24, 2023	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Goodwill
Goodwill		$ 634,282	$ 712,364	$ 744,439
Disposal (1)		(4,781)	(32,075)
Assets held for sale (3)		(4,108)
Impairment		(69,193)
Pacific Northwest Natural Gas Liquids Terminals
Goodwill
Number of terminals sold	2
Water solutions
Goodwill
Goodwill		279,202	283,310	283,310
Disposal (1)		0	0
Assets held for sale (3)		(4,108)
Impairment		0
Crude oil logistics
Goodwill
Goodwill		309,971	309,971	342,046
Disposal (1)		0	(32,075)
Assets held for sale (3)		0
Impairment		0
Liquids logistics
Goodwill
Goodwill		45,109	119,083	$ 119,083
Disposal (1)		(4,781)	$ 0
Assets held for sale (3)		0
Impairment		$ (69,193)