Leases (Table Text Block)	3 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	As of June 30, 2020     (Unaudited)     (In thousands)                   Finance   Operating   Total Buildings and improvements $ - $ 130,241 $ 130,241 Furniture and equipment   21,111   -   21,111 Rental trailers and other rental equipment   115,967   -   115,967 Rental trucks   1,697,339   -   1,697,339 Right-of-use assets, gross   1,834,417   130,241   1,964,658 Less: Accumulated depreciation   (807,489)   (23,559)   (831,048) Right-of-use assets, net $ 1,026,928 $ 106,682 $ 1,133,610
Summary of Weighted-average remaining lease terms and Discount rates	Finance   Operating               Weighted average remaining lease term (years)   4   14   Weighted average discount rate   3.5 % 4.6 %
Components of Lease Expense	Three Months Ended     June 30, 2020     (Unaudited)     (In thousands)       Operating lease costs $ 7,137       Finance lease cost:     Amortization of right-of-use assets $ 40,836 Interest on lease liabilities   6,282 Total finance lease cost $ 47,118
Maturities of Lease Liabilities	Finance leases   Operating leases     (Unaudited) Year ending June 30,   (In thousands)           2021 $ 194,978 $ 24,802 2022   154,457   22,598 2023   122,986   21,780 2024   92,915   20,791 2025   65,825   6,213 Thereafter   35,155   65,758 Total lease payments   666,316   161,942 Less: imputed interest   -   (55,328) Present value of lease liabilities $ 666,316 $ 106,614