Borrowings (Table Text Block)	3 Months Ended	9 Months Ended
	Dec. 31, 2022	Dec. 31, 2022
Debt Instruments [Abstract]
Long-Term Debt		December 31,   March 31,   2023 Rates     Maturities   2022   2022                 (Unaudited)                     (In thousands) Real estate loan (amortizing term) (a) 4.29 % - 5.60 %   2027 - 2037 $ 292,617 $   50,259 Senior mortgages 2.70 % - 5.50 %   2024 - 2042   2,389,419   2,206,268 Real estate loans (revolving credit) – % - – %       2027   –   535,000 Fleet loans (amortizing term) 1.61 % - 5.68 %   2023 - 2029   123,986   124,651 Fleet loans (revolving credit) 2.36 % - 5.44 %   2025 - 2027   615,000   560,000 Finance leases (rental equipment) 2.16 % - 5.04 %   2023 - 2026   252,102   347,393 Finance liabilities (rental equipment) 1.60 % - 5.98 %   2024 - 2030   1,286,299   949,936 Private placements 2.43 % - 2.88 %   2029 - 2035   1,200,000   1,200,000 Other obligations 1.50 % - 8.00 %   2023 - 2049   77,399   86,206 Notes, loans and finance leases payable                   6,236,822   6,059,713 Less: Debt issuance costs                     (36,425)   (37,216) Total notes, loans and finance leases payable, net         $ 6,200,397 $   6,022,497                             (a) Certain loans have interest rate swaps fixing the rates between 2.72% and 2.86% based on current margins.
Annual Maturities of Notes, Loans and Leases Payable		Year Ending December 31,     2023   2024   2025   2026   2027   Thereafter   Total     (Unaudited)         (In thousands)     Notes, loans and finance leases payable, secured$ 517,406 $ 693,638 $ 596,395 $ 861,298 $ 771,004 $ 2,797,081 $ 6,236,822
Components of interest expense	Quarter Ended December 31,     2022   2021     (Unaudited)     (In thousands) Interest expense $ 60,978 $ 43,850 Capitalized interest   (3,818)   (2,222) Amortization of transaction costs   2,336   1,407 Interest expense resulting from cash flow hedges   (455)   1,007 Total interest expense$ 59,041 $ 44,042	Nine Months Ended December 31,     2022   2021     (Unaudited)     (In thousands) Interest expense $ 168,987 $ 122,589 Capitalized interest   (8,684)   (6,974) Amortization of transaction costs   5,596   4,153 Interest expense resulting from cash flow hedges   134   2,997 Total interest expense$ 166,033 $ 122,765
Interest rates and company borrowings	Revolving Credit Activity       Quarter Ended December 31,       2022   2021       (Unaudited)       (In thousands, except interest rates)   Weighted average interest rate during the period   4.68 % 1.38 % Interest rate at the end of the period   5.28 % 1.39 % Maximum amount outstanding during the period $ 765,000 $ 1,085,000   Average amount outstanding during the period $ 710,109 $ 1,081,283   Facility fees$ 270 $ 66	Revolving Credit Activity       Nine Months Ended December 31,       2022   2021       (Unaudited)       (In thousands, except interest rates)   Weighted average interest rate during the period   3.34 % 1.38 % Interest rate at the end of the period   5.28 % 1.39 % Maximum amount outstanding during the period $ 1,105,000 $ 1,093,000   Average amount outstanding during the period $ 892,680 $ 1,081,571   Facility fees$ 439 $ 198