Long-term Debt Borrowings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Debt instrument, maturities:
Notes, loans and leases payable	$ 1,942,359	$ 1,661,845
Real estate loan (amortizing term) - First [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage rate range, minimum	1.66%
Debt instrument, interest rate, stated percentage rate range, maximum	6.93%
Debt instrument, maturities:
Debt instrument, maturity year	2023
Notes, loans and leases payable	250,000	235,000
Real estate loan (amortizing term) - Second [Member]
Debt instrument, maturities:
Notes, loans and leases payable	0	24,630
Real estate loan (revolving credit) [Member]
Debt instrument, maturities:
Debt instrument, maturity year	2015
Notes, loans and leases payable	0	0
Senior mortgages [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage rate range, minimum	2.67%
Debt instrument, interest rate, stated percentage rate range, maximum	5.75%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2015
Debt instrument, maturity year range, end	2038
Notes, loans and leases payable	684,915	556,522
Working capital loan (revolving credit) [Member]
Debt instrument, maturities:
Debt instrument, maturity year	2016
Notes, loans and leases payable	0	0
Fleet Loans, (amortizing term) [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage rate range, minimum	1.95%
Debt instrument, interest rate, stated percentage rate range, maximum	5.57%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2015
Debt instrument, maturity year range, end	2021
Notes, loans and leases payable	370,394	361,079
Fleet Loan, (securitization) [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage (a)	4.90%
Debt instrument, maturities:
Debt instrument, maturity year	2017
Notes, loans and leases payable	90,793	190,801
Fleet Loan (revolving credit) [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage rate range, minimum	1.65%
Debt instrument, interest rate, stated percentage rate range, maximum	1.91%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2017
Debt instrument, maturity year range, end	2018
Notes, loans and leases payable	89,632	0
Capital leases (rental equipment) [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage rate range, minimum	2.23%
Debt instrument, interest rate, stated percentage rate range, maximum	7.82%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2015
Debt instrument, maturity year range, end	2021
Notes, loans and leases payable	416,750	273,458
Other obligations [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage rate range, minimum	3.00%
Debt instrument, interest rate, stated percentage rate range, maximum	8.00%
Debt instrument, maturities:
Debt instrument, maturity year range, start	2014
Debt instrument, maturity year range, end	2044
Notes, loans and leases payable	$ 39,875	$ 20,355