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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 |  |  |  |  |  |  |

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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