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Long-Term Debt (Details Textuals) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 03, 2014 | Apr. 30, 2016 | Jul. 31, 2015 | Jul. 31, 2015 | Sep. 29, 2011 | Dec. 14, 2010
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 1.25% |  |
Reference rate |  |  | 0.19% | 0.19% |  |
Debt instrument costs | $ 2.1 |  |  |  |  |
Capitalized debt issuance fees | 1.0 |  |  |  |  |
Debt discount | 1.1 |  |  |  |  |
Federal Funds Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 0.50% |  |
LIBOR |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 1.00% |  |
Adjusted LIBOR One | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 0.25% |  |
Adjusted LIBOR One | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 1.00% |  |
Adjusted LIBOR Two | Revolving Credit Facility | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 1.25% |  |
Adjusted LIBOR Two | Revolving Credit Facility | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 2.00% |  |
Line of Credit | Revolving Credit Facility | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee rate range |  |  |  | 0.20% |  |
Line of Credit | Revolving Credit Facility | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee rate range |  |  |  | 0.35% |  |
Senior Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Senior notes | 400.0 |  |  |  |  |
Bank of America | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 100.0
Repayments of lines of credit | 275.0 |  |  |  |  |
Bank of America | Line of Credit | Alternative Currency Borrowing Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 100.0
Bank of America | Line of Credit | Letter of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 50.0
Bank of America | Line of Credit | Term Loan Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 500.0 | $ 400.0
Wells Fargo and Bank of America |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maturity date |  |  |  | Dec. 03, 2019 |  |
Wells Fargo and Bank of America | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 300.0 |  |  |  |  |
Outstanding borrowings | 0.0 |  | $ 0.0 | $ 0.0 |  |
Wells Fargo and Bank of America | Line of Credit | Term Loan Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 300.0 |  |  |  |  |
Outstanding borrowings |  |  | 243.8 | $ 243.8 |  |
Amortization of financing costs |  |  | $ 18.8 |  |  |
Wells Fargo and Bank of America | Line of Credit | Forecast | Term Loan Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Amortization of financing costs |  | $ 7.5 |  |  |  |
4.07% Senior Notes, Series A | Senior Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Senior notes | $ 100.0 |  |  |  |  |
Stated interest rate | 4.07% |  |  |  |  |
4.19% Senior Notes, Series B | Senior Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Senior notes | $ 100.0 |  |  |  |  |
Stated interest rate | 4.19% |  |  |  |  |
4.25% Senior Notes, Series C | Senior Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Senior notes | $ 100.0 |  |  |  |  |
Stated interest rate | 4.25% |  |  |  |  |
4.35% Senior Notes, Series D | Senior Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Senior notes | $ 100.0 |  |  |  |  |
Stated interest rate | 4.35% |  |  |  |  |

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