Leases (Components of our right-of-use assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Finance Lease [Abstract]
Buildings and Improvements	$ 142,467	$ 128,221
Furniture and equipment	7,109	9,687
Rental trailers and other rental equipment	115,072	152,294
Rental trucks	816,075	949,838
Right-of-use assets, gross	1,080,723	1,240,040
Less: Accumulated depreciation	(637,674)	(706,358)
Right of use assets, net	443,049	533,682
Finance Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	0	0
Furniture and equipment	7,109	9,687
Rental trailers and other rental equipment	115,072	152,294
Rental trucks	816,075	949,838
Right-of-use assets, gross	938,256	1,111,819
Less: Accumulated depreciation	(560,523)	(637,054)
Right of use assets, net	377,733	474,765
Operating Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	142,467	128,221
Furniture and equipment	0	0
Rental trailers and other rental equipment	0	0
Rental trucks	0	0
Right-of-use assets, gross	142,467	128,221
Less: Accumulated depreciation	(77,151)	(69,304)
Right of use assets, net	$ 65,316	$ 58,917