Leases (Table Text Block)	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Mar. 31, 2022
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	As of December 31, 2022     Finance   Operating   Total     (Unaudited)     (In thousands)               Buildings and improvements $ – $ 142,748 $ 142,748 Furniture and equipment   14,731   –   14,731 Rental trailers and other rental equipment   152,867   –   152,867 Rental trucks   982,119   –   982,119 Right-of-use assets, gross   1,149,717   142,748   1,292,465 Less: Accumulated depreciation   (645,077)   (78,892)   (723,969) Right-of-use assets, net$ 504,640 $ 63,856 $ 568,496	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       December 31,   March 31,       2022   2022       (Unaudited)   Weighted average remaining lease term (years)   2   3   Weighted average discount rate  3.8 % 3.7 %	Operating leases       December 31,   March 31,       2022   2022       (Unaudited)   Weighted average remaining lease term (years)   18.0   16.5   Weighted average discount rate  4.6 % 4.6 %
Components of Lease Expense	Nine Months Ended     December 31, 2022   December 31, 2021     (Unaudited)     (In thousands)           Operating lease costs $ 24,483 $ 24,018           Finance lease cost:         Amortization of right of use assets $ 62,782 $ 90,056 Interest on lease liabilities   8,799   14,290 Total finance lease cost$ 71,581 $ 104,346
Maturities of Lease Liabilities	Finance leases   Operating leases     (Unaudited) Year ending December 31,   (In thousands)           2023 $ 121,093 $ 24,511 2024   85,188   15,398 2025   48,126   5,710 2026   12,114   3,579 2027   –   3,018 Thereafter   –   57,288 Total lease payments   266,521   109,504 Less: imputed interest   (14,419)   (46,102) Present value of lease liabilities$ 252,102 $ 63,402