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Borrowings (Long-term debt borrowings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Debt instrument, maturities:    
Notes, loans and leases payable, gross $ 3,538,699 $ 3,287,233
Less: Debt issuance costs (25,623) (24,353)
Notes, loans and leases payable, net $ 3,513,076 3,262,880
Real estate loan (amortizing term) [Member]    
Debt instrument, maturities:    
Debt instrument, maturity year 2023  
Notes, loans and leases payable, net $ 135,287 169,289
Real estate loan (amortizing term) [Member] | Minimum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 3.24%  
Real estate loan (amortizing term) [Member] | Maximum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 6.93%  
Senior mortgages [Member]    
Debt instrument, maturities:    
Debt instrument, maturity year range, start 2021  
Debt instrument, maturity year range, end 2038  
Notes, loans and leases payable, net $ 1,487,645 1,292,160
Senior mortgages [Member] | Minimum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 3.72%  
Senior mortgages [Member] | Maximum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 6.62%  
Working capital loan (revolving credit) [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 3.15%  
Debt instrument, maturities:    
Debt instrument, maturity year 2018  
Notes, loans and leases payable, net $ 55,000 85,000
Fleet loans (amortizing) [Member]    
Debt instrument, maturities:    
Debt instrument, maturity year range, start 2018  
Debt instrument, maturity year range, end 2025  
Notes, loans and leases payable, net $ 342,971 324,977
Fleet loans (amortizing) [Member] | Minimum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 1.95%  
Fleet loans (amortizing) [Member] | Maximum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 4.76%  
Fleet loans (securitization) [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 4.90%  
Debt instrument, maturities:    
Notes, loans and leases payable, net 52,112
Fleet Loans (revolving credit) [Member]    
Debt instrument, maturities:    
Debt instrument, maturity year range, start 2020  
Debt instrument, maturity year range, end 2021  
Notes, loans and leases payable, net $ 460,000 417,000
Fleet Loans (revolving credit) [Member] | Minimum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 2.80%  
Fleet Loans (revolving credit) [Member] | Maximum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 2.81%  
Capital leases (rental equipment) [Member]    
Debt instrument, maturities:    
Debt instrument, maturity year range, start 2018  
Debt instrument, maturity year range, end 2025  
Notes, loans and leases payable, net $ 984,217 876,828
Capital leases (rental equipment) [Member] | Minimum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 1.92%  
Capital leases (rental equipment) [Member] | Maximum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 4.80%  
Other Obligations [Member]    
Debt instrument, maturities:    
Debt instrument, maturity year range, start 2018  
Debt instrument, maturity year range, end 2047  
Notes, loans and leases payable, net $ 73,579 $ 69,867
Other Obligations [Member] | Minimum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 2.75%  
Other Obligations [Member] | Maximum [Member]    
Debt instruments, interest rate, stated percentage:    
Debt instrument, interest rate, stated percentage [1] 8.00%  
[1] Interest rate as of March 31, 2017, including the effect of applicable hedging instruments