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Debt (Details) - USD ($)
$ in Thousands
Jul. 31, 2017
Jan. 31, 2017
Sep. 30, 2012
Debt Instrument      
Other Long-term Debt $ 12,053 $ 0  
Debt and Capital Lease Obligations 2,268,025 1,363,047  
Less-current maturities (included as Revolving credit loans and current portion of long-term debt, net) (465,407) (373,123)  
Long-term Debt and Capital Lease Obligations 1,802,618 989,924  
Senior Notes      
Debt Instrument      
Unamortized debt discount and debt issuance costs (9,574) (10,633)  
Senior Notes. net 1,340,426 1,339,367  
Senior Notes | 3.70% Senior Notes      
Debt Instrument      
Debt Instrument, Face Amount 500,000 500,000  
Senior Notes | 4.95% Senior Notes      
Debt Instrument      
Debt Instrument, Face Amount 500,000 500,000  
Senior Notes | 3.75% Senior Notes      
Debt Instrument      
Debt Instrument, Face Amount 350,000 350,000 $ 350,000
Term Loan      
Debt Instrument      
Loans Payable 800,000 0  
Other Committed And Uncommitted Revolving Credit Facilities      
Debt Instrument      
Revolving Credit Loan $ 115,546 $ 23,680