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Debt | Other Credit Facilities (Details) - USD ($)
3 Months Ended
Apr. 30, 2017
Feb. 27, 2017
Jan. 31, 2017
Line of Credit Facility      
Accounts Receivable, Net, Current $ 4,538,603,000   $ 3,047,927,000
Standby Letters Of Credit 29,500,000    
Credit Agreement      
Line of Credit Facility      
Line of Credit Facility, Maximum Borrowing Capacity 1,000,000,000    
Line Of Credit Facility Possible Future Increase To Maximum Borrowing Capacity 1,250,000,000    
Long-term Line of Credit 0   0
Term loan credit agreement      
Line of Credit Facility      
Other Loans Payable, Long-term, Noncurrent 800,000,000    
Debt Instrument, Face Amount   $ 1,000,000,000  
Receivables Securitization Program      
Line of Credit Facility      
Line of Credit Facility, Maximum Borrowing Capacity 400,000,000    
Accounts Receivable, Net, Current 712,100,000   748,600,000
Line of Credit, Amount Outstanding 0   0
Other Committed And Uncommitted Revolving Credit Facilities      
Line of Credit Facility      
Line of Credit Facility, Maximum Borrowing Capacity 348,400,000    
Line of Credit, Current $ 125,300,000   $ 23,700,000
Debt Instrument, Interest Rate, Stated Percentage 6.40%   8.35%
3 year maturity | Term loan credit agreement      
Line of Credit Facility      
Repayments of Lines of Credit $ 150,000,000    
Other Loans Payable, Long-term, Noncurrent 100,000,000    
Debt Instrument, Face Amount   250,000,000  
5 year maturity | Term loan credit agreement      
Line of Credit Facility      
Repayments of Lines of Credit 50,000,000    
Other Loans Payable, Long-term, Noncurrent $ 700,000,000    
Debt Instrument, Face Amount   $ 750,000,000