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Long-Term Debt - Credit Agreement Additional Information (Detail) | Nov. 30, 2016 | Nov. 03, 2016 USD ($) | Jul. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Dec. 19, 2012 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Less deferred financing costs |  |  | $ 6,900,000 | $ 0 |
Long-term debt |  |  | 1,056,900,000 | 974,600,000 |
Current portion of long-term debt |  |  | 16,300,000 | 0 |
Long-term debt, excluding current maturities |  |  | $ 1,033,700,000 | 974,600,000 |
2017 Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issued |  | $ 300,000,000.0 |  |  |
Optional additional borrowing capacity |  | $ 550,000,000 |  |  |
Leverage ratio, adjusted EBITDA | 4.00 |  |  |  |
Leverage ratio, adjusted EBITDA during collateral release period |  | 3.75 |  |  |
Interest coverage ratio, adjusted EBITDA |  | 3.00 |  |  |
Weighted average interest rate |  |  | 2.07% |  |
Actual interest rate |  |  | 2.49% |  |
Revolving Credit Facility | 2017 Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 800,000,000 |  |  |
Reduction in outstanding letter of credit |  |  | $ 11,900,000 |  |
Less deferred financing costs |  |  | 6,000,000 |  |
Long-term debt |  |  | 418,900,000 | 0 |
Current portion of long-term debt |  |  | 15,000,000 |  |
Long-term debt, excluding current maturities |  |  | 403,900,000 |  |
Line of Credit | Prior Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,000,000,000
Current borrowing available |  |  | 661,700,000 |  |
Amount used to pay outstanding obligations and costs and expenses incurred |  | $ 208,000,000 |  |  |
Long-term debt |  |  | $ 0 | $ 201,200,000 |

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