Debt (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended			0 Months Ended			0 Months Ended
	Jan. 12, 2011	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	May 31, 2012	May 31, 2012 Minimum [Member]	May 31, 2012 Maximum [Member]	May 31, 2012 Revolving Credit Facilities [Member]	May 31, 2012 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, initiation date	Jan. 12, 2011
Aggregate commitment amount of credit facilities									$ 1,000,000,000
Additional borrowings										500,000,000
Expiration date										May 31, 2017
Commitment fee percentage							0.10%	0.275%
Line of credit facility interest rate margin on base rate loans percentage							0.00%	0.75%
Line of credit facility interest rate margin on foreign currency loans percentage							1.00%	1.75%
Required minimum Interest coverage ratio						3.00
Required maximum total leverage ratio						3.75
Interest Coverage Ratio		49.74		49.74
Total Leverage Ratio		0.49		0.49
Amount available under the credit agreement		786,200,000		786,200,000
Write-off debt issuance costs in interest expense		0	1,404,000	0	1,404,000
Existing debt issuance costs			6,000,000		6,000,000
Debt issuance costs incurred to refinance Credit Agreement			$ 1,300,000