Leases (Table Text Block)	9 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	As of December 31, 2019     Finance   Operating   Total     (Unaudited)     (In thousands)               Buildings and improvements $ – $ 121,919 $ 121,919 Furniture and equipment   27,309   –   27,309 Rental trailers and other rental equipment   117,987   –   117,987 Rental trucks   1,746,036   –   1,746,036 Right-of-use assets, gross   1,891,332   121,919   2,013,251 Less: Accumulated depreciation   (760,859)   (13,945)   (774,804) Right-of-use assets, net $ 1,130,473 $ 107,974 $ 1,238,447
Summary of Weighted-average remaining lease terms and Discount rates	Finance   Operating       (Unaudited)   Weighted average remaining lease term (years)   4 Years   5 Years   Weighted average discount rate   3.43 % 4.60 %
Components of Lease Expense	Nine Months Ended     December 31, 2019     (Unaudited)     (In thousands)       Operating lease costs $ 20,324       Finance lease cost:     Amortization of right-of-use assets $ 143,574 Interest on lease liabilities   24,083 Total finance lease cost $ 167,657
Maturities of Lease Liabilities	Finance leases   Operating leases     (Unaudited) Year ending December 31,   (In thousands)           2020 $ 231,189 $ 23,585 2021   174,105   21,204 2022   132,805   20,354 2023   115,521   19,689 2024   82,385   12,195 Thereafter   59,460   67,422 Total lease payments   795,465   164,449 Less: imputed interest   –   (56,868) Present value of lease liabilities $ 795,465 $ 107,581