Leases (Table Text Block)	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	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	As of March 31, 2021 Finance Operating Total (In thousands) Buildings and improvements $ – $ 132,901 $ 132,901 Furniture and equipment 22,316 – 22,316 Rental trailers and other rental equipment 203,594 – 203,594 Rental trucks 1,494,098 – 1,494,098 Right-of-use assets, gross 1,720,008 132,901 1,852,909 Less: Accumulated depreciation (842,970) (40,396) (883,366) Right-of-use assets, net$ 877,038 $ 92,505 $ 969,543
Summary of Weighted-average remaining lease terms and Discount rates	Financing leases March 31, 2022 2021 Weighted average remaining lease term (years) 3 3 Weighted average discount rate 3.7 % 3.6 %	Operating leases March 31, 2022 2021 Weighted average remaining lease term (years) 16.5 14.7 Weighted average discount rate 4.6 % 4.6 %
Lease costs	Twelve Months Ended March 31, 2022 2021 (In thousands) Operating lease costs $ 30,239 $ 30,551 Finance lease cost: Amortization of right-of-use assets $ 115,199 $ 150,994 Interest on lease liabilities 15,289 22,405 Total finance lease cost$ 130,488 $ 173,399
Maturities of Lease Liabilities	Finance leases Operating leases Year ending March 31, (In thousands) 2023 $ 133,577 $ 23,311 2024 111,781 21,903 2025 78,280 10,630 2026 47,064 4,162 2027 – 3,061 Thereafter – 59,348 Total lease payments 370,702 122,415 Less: imputed interest (23,309) (48,218) Present value of lease liabilities$ 347,393 $ 74,197

Leases (Table Text Block)

12 Months Ended

Mar. 31, 2022

Mar. 31, 2021

Supplemental Balance Sheet Information Related to Leases

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

As of March 31, 2021 Finance Operating Total (In thousands) Buildings and improvements $ – $ 132,901 $ 132,901 Furniture and equipment 22,316 – 22,316 Rental trailers and other rental equipment 203,594 – 203,594 Rental trucks 1,494,098 – 1,494,098 Right-of-use assets, gross 1,720,008 132,901 1,852,909 Less: Accumulated depreciation (842,970) (40,396) (883,366) Right-of-use assets, net$ 877,038 $ 92,505 $ 969,543

Summary of Weighted-average remaining lease terms and Discount rates

Financing leases March 31, 2022 2021 Weighted average remaining lease term (years) 3 3 Weighted average discount rate 3.7 % 3.6 %

Operating leases March 31, 2022 2021 Weighted average remaining lease term (years) 16.5 14.7 Weighted average discount rate 4.6 % 4.6 %

Lease costs

Twelve Months Ended March 31, 2022 2021 (In thousands) Operating lease costs $ 30,239 $ 30,551 Finance lease cost: Amortization of right-of-use assets $ 115,199 $ 150,994 Interest on lease liabilities 15,289 22,405 Total finance lease cost$ 130,488 $ 173,399

Maturities of Lease Liabilities

Finance leases Operating leases Year ending March 31, (In thousands) 2023 $ 133,577 $ 23,311 2024 111,781 21,903 2025 78,280 10,630 2026 47,064 4,162 2027 – 3,061 Thereafter – 59,348 Total lease payments 370,702 122,415 Less: imputed interest (23,309) (48,218) Present value of lease liabilities$ 347,393 $ 74,197