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Long-Term Debt (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended | 3 Months Ended |  | 0 Months Ended | 3 Months Ended |  |  |
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Oct. 31, 2013 | Oct. 31, 2013 Revolving Credit Facility | Mar. 01, 2013 Revolving Credit Facility Minimum | Oct. 31, 2013 Revolving Credit Facility Minimum | Sep. 29, 2011 Revolving Credit Facility Minimum | Mar. 01, 2013 Revolving Credit Facility Maximum | Oct. 31, 2013 Revolving Credit Facility Maximum | Sep. 29, 2011 Revolving Credit Facility Maximum | Oct. 31, 2013 Alternative currency borrowing credit facility | Oct. 31, 2013 Letter of Credit | Oct. 31, 2013 Term Loan Facility | Oct. 31, 2013 Term Loan Facility Original Limit | Jan. 14, 2011 Term Loan Facility Original Limit
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 100.0 |  |  | $ 400.0 |  |  | $ 500.0 | $ 100.0 | $ 50.0 |  | $ 400.0 | $ 400.0
Net leverage ratio |  |  | 1:1 |  |  | 1.5:1 |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  |  |  |  |  | 350.0 |  |
Quarterly payments for term loan |  |  |  |  |  |  |  |  |  |  | $ 18.8 |  |
Maturity date |  | Dec. 14, 2015 |  |  |  |  |  |  |  |  |  |  |
Reference rate basis | (i) the Eurocurrency Rate; (ii) the Federal Funds Rate; or (iii) the Prime Rate as described in the Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Reference rate | 0.18% |  |  |  |  |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate | 1.50% |  |  | 1.50% |  |  | 2.00% |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.075% |  |  | 0.125% |  |  |  |  |  |
Line of credit facility interest rate during period | 2.00% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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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