Leases (Components Right Of Use Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Finance Lease [Abstract]
Building and Improvements	$ 132,901	$ 125,547
Furniture and equipment	22,316	21,113
Rental trailers and rental equipment	203,594	219,581
Rental trucks	1,494,098	1,634,572
Right Of Use Assets Gross	1,852,909	2,000,813
less: accumulated depreciation	(883,366)	(813,829)
Right of use assets, net	969,543	1,186,984
Finance Lease [Member]
Finance Lease [Abstract]
Building and Improvements	0	0
Furniture and equipment	22,316	21,113
Rental trailers and rental equipment	203,594	219,581
Rental trucks	1,494,098	1,634,572
Right Of Use Assets Gross	1,720,008	1,875,266
less: accumulated depreciation	(842,970)	(794,913)
Right of use assets, net	877,038	1,080,353
Operating Lease [Member]
Finance Lease [Abstract]
Building and Improvements	132,901	125,547
Furniture and equipment	0	0
Rental trailers and rental equipment	0	0
Rental trucks	0	0
Right Of Use Assets Gross	132,901	125,547
less: accumulated depreciation	(40,396)	(18,916)
Right of use assets, net	$ 92,505	$ 106,631