Debt (Other Facilities) (Narrative) (Details) (USD $)	1 Months Ended
	Oct. 31, 2012	Jan. 31, 2014	Jan. 31, 2013
Debt Instrument [Line Items]
U.S. trade receivables		$ 3,215,729,000	$ 3,215,920,000
Line of credit, outstanding amount		42,900,000
Standby letters of credit issued		83,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		500,000,000.0
Possible future increase of maximum borrowing capacity		750,000,000.0
Line of credit, outstanding amount			42,900,000
Line of credit facility, interest rate at period end			1.65%
Receivables Securitization Program [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		400,000,000.0
U.S. trade receivables		623,000,000	690,600,000
Renewal period for program	2 years
Line of credit, outstanding amount		0	83,500,000
Line of credit facility, interest rate at period end			1.02%
Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2017
Debt Instrument [Line Items]
Maximum borrowing capacity		429,600,000
Line of credit, outstanding amount		42,900,000	40,600,000
Line of credit facility, interest rate at period end		6.15%	4.76%
Line of Credit Facility, Current Borrowing Capacity		$ 891,000,000