Borrowings (Table Text Block)	3 Months Ended	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Debt Instruments [Abstract]
Long-Term Debt		Long-term debt was as follows:                       December 31,   March 31,   2020 Rates (a)     Maturities   2019   2019                 (Unaudited)                     (In thousands) Real estate loan (amortizing term)       3.22 %       2023 $ 95,413 $ 102,913 Senior mortgages 3.36 % - 6.62 %   2021 - 2038   1,953,704   1,741,652 Real estate loans (revolving credit) 3.03 % - 3.20 %   2022 - 2024   435,000   429,400 Fleet loans (amortizing term) 1.95 % - 4.66 %   2020 - 2027   231,043   263,209 Fleet loans (revolving credit) 2.84 % - 2.86 %   2022 - 2024   585,000   530,000 Finance/capital leases (rental equipment) 1.92 % - 5.04 %   2020 - 2026   795,465   1,042,652 Finance liability (rental equipment) 2.73 % - 4.22 %   2024 - 2026   398,157   – Other obligations 2.50 % - 8.00 %   2020 - 2048   84,159   82,417 Notes, loans and finance/capital leases payable                   4,577,941   4,192,243 Less: Debt issuance costs                     (29,332)   (28,920) Total notes, loans and finance/capital leases payable, net         $ 4,548,609 $ 4,163,323                             (a) Interest rates as of December 31, 2019, including the effect of applicable hedging instruments.
Annual Maturities of Notes, Loans and Leases Payable		Year Ending December 31,     2020   2021   2022   2023   2024   Thereafter     (Unaudited)     (In thousands) Notes, loans and finance/capital leases payable, secured $ 483,060 $ 446,465 $ 995,089 $ 596,752 $ 586,102 $ 1,470,473
Components of interest expense	Quarter Ended December 31,     2019   2018     (Unaudited)     (In thousands) Interest expense $ 45,037 $ 38,825 Capitalized interest   (5,775)   (5,055) Amortization of transaction costs   1,176   909 Interest expense effect resulting from cash flow hedges   (465)   148 Total interest expense $ 39,973 $ 34,827	Nine Months Ended December 31,     2019   2018     (Unaudited)     (In thousands) Interest expense $ 133,111 $ 109,241 Capitalized interest   (17,943)   (7,701) Amortization of transaction costs   3,276   2,751 Interest expense effect resulting from cash flow hedges   (461)   820 Total interest expense $ 117,983 $ 105,111
Interest rates and company borrowings	Revolving Credit Activity       Quarter Ended December 31,       2019   2018       (Unaudited)       (In thousands, except interest rates)   Weighted average interest rate during the quarter   3.09 % 3.52 % Interest rate at the end of the quarter   2.95 % 3.57 % Maximum amount outstanding during the quarter $ 1,025,000 $ 865,000   Average amount outstanding during the quarter $ 1,014,511 $ 812,174   Facility fees $ 40 $ 41	Revolving Credit Activity       Nine Months Ended December 31,       2019   2018       (Unaudited)       (In thousands, except interest rates)   Weighted average interest rate during the period   3.44 % 3.31 % Interest rate at the end of the period   2.95 % 3.57 % Maximum amount outstanding during the period $ 1,025,000 $ 865,000   Average amount outstanding during the period $ 995,508 $ 632,509   Facility fees $ 147 $ 313