Debt (Other Facilities) (Narrative) (Details) (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Debt Instrument [Line Items]
U.S. trade receivables	$ 2,871,243,000	$ 2,896,671,000
Line of credit, outstanding amount	48,000,000	550,200,000
Standby letters of credit issued	75,100,000
Other committed and uncommitted lines of credit and overdraft facilities	1,500,000,000
Receivables Securitization Program [Member]
Debt Instrument [Line Items]
Line of credit facility, initiation date	August 2011
Maximum borrowing capacity	400,000,000
U.S. trade receivables	619,800,000	549,800,000
Multi-Currency Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit loans, expiration date	March 2012
Multi-currency Revolving Credit Facility	250,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility, initiation date	September 2011
Maximum borrowing capacity	500,000,000
Possible future increase of maximum borrowing capacity	750,000,000
Revolving credit loans, expiration date	September 27, 2016
Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2013 [Member]
Debt Instrument [Line Items]
Other committed and uncommitted lines of credit and overdraft facilities	$ 550,200,000