Leases (Components of our right-of-use assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023
Finance Lease [Abstract]
Buildings and Improvements	$ 133,248	$ 128,221
Furniture and equipment	7,109	9,687
Rental trailers and other rental equipment	128,865	152,294
Rental trucks	879,054	949,838
Right-of-use assets, gross	1,148,276	1,240,040
Less: Accumulated depreciation	(668,302)	(706,358)
Right of use assets, net	479,974	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	128,865	152,294
Rental trucks	879,054	949,838
Right-of-use assets, gross	1,015,028	1,111,819
Less: Accumulated depreciation	(594,532)	(637,054)
Right of use assets, net	420,496	474,765
Operating Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	133,248	128,221
Furniture and equipment	0	0
Rental trailers and other rental equipment	0	0
Rental trucks	0	0
Right-of-use assets, gross	133,248	128,221
Less: Accumulated depreciation	(73,770)	(69,304)
Right of use assets, net	$ 59,478	$ 58,917