Debt (Other Facilities) (Narrative) (Details) (USD $)	1 Months Ended
	Oct. 31, 2012	Apr. 30, 2013	Jan. 31, 2013
Debt Instrument [Line Items]
Line of credit, outstanding amount		$ 34,100,000
U.S. trade receivables		2,749,087,000	3,215,920,000
Standby letters of credit issued		81,400,000
Credit Agreement
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		0	42,900,000
Line of credit facility, interest rate at period end			1.65%
Receivables Securitization Program
Debt Instrument [Line Items]
Maximum borrowing capacity		400,000,000.0
Line of credit, outstanding amount		0	83,500,000
Line of credit facility, interest rate at period end			1.02%
U.S. trade receivables		630,600,000	690,600,000
Renewal Period	2 years
Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2017
Debt Instrument [Line Items]
Maximum borrowing capacity		566,900,000
Line of credit, outstanding amount		34,100,000	40,600,000
Weighted average interest rate		5.14%	4.76%
Other committed and uncommitted lines of credit and overdraft facilities		$ 779,000,000