Debt (Other Facilities) (Narrative) (Details) (USD $)												1 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012		Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2013 Credit Agreement [Member]	Jan. 31, 2012 Credit Agreement [Member]	Oct. 31, 2012 Receivables Securitization Program [Member]	Jan. 31, 2013 Receivables Securitization Program [Member]	Jan. 31, 2012 Receivables Securitization Program [Member]	Jan. 31, 2013 Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2017	Jan. 31, 2012 Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2017
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 500,000,000.0			$ 400,000,000.0	$ 0	$ 579,200,000
Possible future increase of maximum borrowing capacity										750,000,000.0
U.S. trade receivables	3,215,920,000	2,729,523,000	2,574,108,000	2,595,886,000	2,778,641,000	[1]	2,863,609,000	2,750,223,000	2,863,654,000				690,600,000	619,800,000
Renewal period for program												2 years
Line of credit, outstanding amount	167,000,000									42,900,000	0		83,500,000		40,600,000	48,000,000
Line of credit facility, interest rate at period end										1.65%			1.02%		4.76%	7.15%
Line of Credit Facility, Current Borrowing Capacity															767,100,000
Standby letters of credit issued	$ 84,400,000

[1] See Note 2 - Restatement of Consolidated Financial Statements.