Leases (Table Text Block)	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	As of June 30, 2022     Finance   Operating   Total     (Unaudited)     (In thousands) Buildings and improvements $ – $ 139,799 $ 139,799 Furniture and equipment   14,731   –   14,731 Rental trailers and other rental equipment   159,618   –   159,618 Rental trucks   1,044,124   –   1,044,124 Right-of-use assets, gross   1,218,473   139,799   1,358,272 Less: Accumulated depreciation   (650,250)   (67,261)   (717,511) Right-of-use assets, net$ 568,223 $ 72,538 $ 640,761	As of March 31, 2022     Finance   Operating   Total     (In thousands) Buildings and improvements $ – $ 136,444 $ 136,444 Furniture and equipment   14,731   –   14,731 Rental trailers and other rental equipment   169,514   –   169,514 Rental trucks   1,114,248   –   1,114,248 Right-of-use assets, gross   1,298,493   136,444   1,434,937 Less: Accumulated depreciation   (677,669)   (62,062)   (739,731) Right-of-use assets, net$ 620,824 $ 74,382 $ 695,206
Summary of Weighted-average remaining lease terms and Discount rates	Finance leases       June 30,   March 31,       2022   2022       (Unaudited)       Weighted average remaining lease term (years)   3   3   Weighted average discount rate  3.7 % 3.7 %	Operating leases       June 30,   March 31,       2022   2022       (Unaudited)       Weighted average remaining lease term (years)   16.8   16.5   Weighted average discount rate  4.6 % 4.6 %
Components of Lease Expense	Three Months Ended     June 30, 2022   June 30, 2021     (Unaudited)     (In thousands)           Operating lease costs $ 7,920 $ 8,077           Finance lease cost:         Amortization of right-of-use assets $ 22,396 $ 32,500 Interest on lease liabilities   3,218   4,571 Total finance lease cost$ 25,614 $ 37,071
Maturities of Lease Liabilities	Finance leases   Operating leases     (Unaudited) Years ending June 30,   (In thousands)           2023 $ 131,322 $ 24,483 2024   97,721   22,162 2025   68,034   7,188 2026   35,396   4,104 2027   –   3,273 Thereafter   –   58,654 Total lease payments   332,473   119,864 Less: imputed interest   (20,062)   (47,587) Present value of lease liabilities$ 312,411 $ 72,277