Leases (Components of our right-of-use assets) (Details) - USD ($)	Dec. 31, 2023	Mar. 31, 2023
Finance Lease [Abstract]
Buildings and Improvements	$ 145,958	$ 128,221,000
Furniture and equipment	1,693	9,687,000
Rental trailers and other rental equipment	114,884	152,294,000
Rental trucks	692,955	949,838,000
Right-of-use assets, gross	955,490	1,240,040,000
Less: Accumulated depreciation	(563,885)	(706,358,000)
Right of use assets, net	391,605	533,682,000
Finance Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	0	0
Furniture and equipment	1,693	9,687,000
Rental trailers and other rental equipment	114,884	152,294,000
Rental trucks	692,955	949,838,000
Right-of-use assets, gross	809,532	1,111,819,000
Less: Accumulated depreciation	(483,288)	(637,054,000)
Right of use assets, net	326,244	474,765,000
Operating Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	145,958	128,221,000
Furniture and equipment	0	0
Rental trailers and other rental equipment	0	0
Rental trucks	0	0
Right-of-use assets, gross	145,958	128,221,000
Less: Accumulated depreciation	(80,597)	(69,304,000)
Right of use assets, net	$ 65,361	$ 58,917,000