Leases (Components of our right-of-use assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022
Finance Lease [Abstract]
Buildings and Improvements	$ 139,799	$ 136,444
Furniture and equipment	14,731	14,731
Rental trailers and other rental equipment	159,618	169,514
Rental trucks	1,044,124	1,114,248
Right-of-use assets, gross	1,358,272	1,434,937
Less: Accumulated depreciation	(717,511)	(739,731)
Right of use assets, net	640,761	695,206
Finance Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	0	0
Furniture and equipment	14,731	14,731
Rental trailers and other rental equipment	159,618	169,514
Rental trucks	1,044,124	1,114,248
Right-of-use assets, gross	1,218,473	1,298,493
Less: Accumulated depreciation	(650,250)	(677,669)
Right of use assets, net	568,223	620,824
Operating Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	139,799	136,444
Furniture and equipment	0	0
Rental trailers and other rental equipment	0	0
Rental trucks	0	0
Right-of-use assets, gross	139,799	136,444
Less: Accumulated depreciation	(67,261)	(62,062)
Right of use assets, net	$ 72,538	$ 74,382