Leases (Components of our right-of-use assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Finance Lease [Abstract]
Buildings and Improvements	$ 141,302	$ 136,444
Furniture and equipment	14,731	14,731
Rental trailers and other rental equipment	153,020	169,514
Rental trucks	996,946	1,114,248
Right-of-use assets, gross	1,305,999	1,434,937
Less: Accumulated depreciation	(708,791)	(739,731)
Right of use assets, net	597,208	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	153,020	169,514
Rental trucks	996,946	1,114,248
Right-of-use assets, gross	1,164,697	1,298,493
Less: Accumulated depreciation	(635,697)	(677,669)
Right of use assets, net	529,000	620,824
Operating Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	141,302	136,444
Furniture and equipment	0	0
Rental trailers and other rental equipment	0	0
Rental trucks	0	0
Right-of-use assets, gross	141,302	136,444
Less: Accumulated depreciation	(73,094)	(62,062)
Right of use assets, net	$ 68,208	$ 74,382