Borrowings (Long-term Debt Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Mar. 31, 2023
Debt instrument, maturities:
Debt Instrument Carrying Amount	$ 5,961,511	$ 5,961,511	$ 5,710,735
Notes, loans and finance/capital leases payable	6,436,800	6,436,800	6,143,350
Less: Debt issuance costs	(35,901)	(35,901)	(35,308)
Total notes, loans and finance/capital leases payable, net	$ 6,400,899	$ 6,400,899	6,108,042
Real estate loan (amortizing term) [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	5.89%	5.89%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2027
Debt instrument, maturity year range, end	2037
Debt Instrument Carrying Amount	$ 283,707	$ 283,707	289,647
Real estate loan (amortizing term) [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	4.30%	4.30%
Real estate loan (amortizing term) [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	6.80%	6.80%
Senior Mortgages [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	4.18%	4.18%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2024
Debt instrument, maturity year range, end	2042
Debt Instrument Carrying Amount	$ 2,487,320	$ 2,487,320	2,371,231
Senior Mortgages [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.70%	2.70%
Senior Mortgages [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.66%	5.66%
Real estate loans (revolving credit) [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	0.00%	0.00%
Debt instrument, maturities:
Debt instrument, maturity year range, end	2027
Debt Instrument Carrying Amount	$ 0	$ 0	0
Real estate loans (revolving credit) [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	0.00%	0.00%
Real estate loans (revolving credit) [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	0.00%	0.00%
Fleet loans (amortizing term) [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	3.76%	3.76%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2024
Debt instrument, maturity year range, end	2029
Debt Instrument Carrying Amount	$ 90,071	$ 90,071	111,856
Fleet loans (amortizing term) [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.61%	1.61%
Fleet loans (amortizing term) [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.68%	5.68%
Fleet loans (revolving credit) [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	5.97%	5.97%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2026
Debt instrument, maturity year range, end	2028
Debt Instrument Carrying Amount	$ 593,889	$ 593,889	615,000
Fleet loans (revolving credit) [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.36%	2.36%
Fleet loans (revolving credit) [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	6.68%	6.68%
Capital Leases (rental equipment) [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	4.00%	4.00%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2023
Debt instrument, maturity year range, end	2026
Debt Instrument Carrying Amount	$ 163,453	$ 163,453	223,205
Capital Leases (rental equipment) [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.39%	2.39%
Capital Leases (rental equipment) [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.01%	5.01%
Finance capital lease [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	4.38%	4.38%
Debt instrument, maturities:
Debt instrument, maturity year range, start		2024
Debt instrument, maturity year range, end	2031
Debt Instrument Carrying Amount	$ 1,544,608	$ 1,544,608	1,255,763
Finance capital lease [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.60%	1.60%
Finance capital lease [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	6.48%	6.48%
Private Placement
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	2.65%	2.65%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2029
Debt instrument, maturity year range, end	2035
Debt Instrument Carrying Amount	$ 1,200,000	$ 1,200,000	1,200,000
Private Placement | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.43%	2.43%
Private Placement | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.88%	2.88%
Other Obligations [Member]
Debt instruments, interest rate, stated percentage:
Debt Weighted Average Interest Rate	6.10%	6.10%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2023
Debt instrument, maturity year range, end	2049
Debt Instrument Carrying Amount	$ 73,752	$ 73,752	$ 76,648
Other Obligations [Member] | Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.50%	1.50%
Other Obligations [Member] | Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	8.00%	8.00%