Borrowings (Table Text Block)	12 Months Ended
	Mar. 31, 2021
Debt Instruments [Abstract]
Long-Term Debt	March 31,   2021 Rates   Maturities   2021   2020                     (In thousands) Real estate loan (amortizing term)       1.61 %     2023 $ 82,913 $ 92,913 Senior mortgages 2.80 % - 6.62 % 2021 - 2038   2,125,324   2,029,878 Real estate loans (revolving credit) (a) 1.36 % - 1.61 % 2023 - 2025   535,000   519,000 Fleet loans (amortizing term) 1.61 % - 4.66 % 2022 - 2028   176,295   224,089 Fleet loans (revolving credit) 1.27 % - 2.36 % 2023 - 2025   535,000   567,000 Finance leases (rental equipment) 1.92 % - 5.04 % 2021 - 2027   513,623   734,870 Finance liability (rental equipment) 1.60 % - 4.22 % 2024 - 2029   644,375   398,834 Other obligations 2.25 % - 8.00 % 2021 - 2049   86,085   84,484 Notes, loans and finance leases payable                 $ 4,698,615 $ 4,651,068 Less: Debt issuance costs                   (29,708)   (29,777) Total notes, loans and finance leases payable, net                 $ 4,668,907 $ 4,621,291                           (a) Certain loans have interest rate swaps fixing the rate between 3.03% and 3.14% based on current margin
Annual Maturities of Notes, Loans and Leases Payable	Years Ended March 31,     2022   2023   2024   2025   2026   Thereafter   Total     (In thousands) Notes, loans and finance leases payable, secured $ 465,884 $ 593,020 $ 1,018,407 $ 769,125 $ 352,162 $ 1,500,017 $ 4,698,615