Leases (Table Text Block)	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Mar. 31, 2022
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	As of June 30, 2023     Finance   Operating   Total     (Unaudited)     (In thousands) Buildings and improvements $ – $ 133,248 $ 133,248 Furniture and equipment   7,109   –   7,109 Rental trailers and other rental equipment   128,865   –   128,865 Rental trucks   879,054   –   879,054 Right-of-use assets, gross   1,015,028   133,248   1,148,276 Less: Accumulated depreciation   (594,532)   (73,770)   (668,302) Right-of-use assets, net$ 420,496 $ 59,478 $ 479,974	As of March 31, 2023     Finance   Operating   Total     (In thousands) Buildings and improvements $ – $ 128,221 $ 128,221 Furniture and equipment   9,687   –   9,687 Rental trailers and other rental equipment   152,294   –   152,294 Rental trucks   949,838   –   949,838 Right-of-use assets, gross   1,111,819   128,221   1,240,040 Less: Accumulated depreciation   (637,054)   (69,304)   (706,358) Right-of-use assets, net$ 474,765 $ 58,917 $ 533,682
Summary of Weighted-average remaining lease terms and Discount rates	Finance leases       June 30,   March 31,       2023   2023       (Unaudited)       Weighted average remaining lease term (years)   2   2   Weighted average discount rate  3.9 % 3.8 %	Operating leases       June 30,   March 31,       2023   2023       (Unaudited)       Weighted average remaining lease term (years)   20.3   19.2   Weighted average discount rate  4.7 % 4.7 %
Components of Lease Expense	Three Months Ended     June 30, 2023   June 30, 2022     (Unaudited)     (In thousands)           Operating lease costs $ 8,102 $ 7,920           Finance lease cost:         Amortization of right-of-use assets $ 16,754 $ 22,396 Interest on lease liabilities   2,146   3,218 Total finance lease cost$ 18,900 $ 25,614
Maturities of Lease Liabilities	Finance leases   Operating leases     (Unaudited) Years ending March 31,   (In thousands)           2024 (9 months) $ 75,174 $ 18,686 2025   77,194   12,244 2026   46,457   5,534 2027   –   4,087 2028   –   3,483 Thereafter   –   62,497 Total lease payments   198,825   106,531 Less: imputed interest   (9,788)   (47,723) Present value of lease liabilities$ 189,037 $ 58,808