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Debt - Additional Information (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 USD ($) | Aug. 31, 2019 USD ($) covenant | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Apr. 16, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 462,559 | $ 535,059 |  |
Long-term Debt, Current Maturities |  | (7,500) | (30,000) |  |
Long-term debt, net |  | 452,945 | 502,695 |  |
Maximum borrowing capacity |  | 600,000 |  |  |
Senior credit facility expansion option, available |  | 300,000 |  |  |
Repayments of Senior Debt |  | 0 | 0 | $ 500 |
Cash interest payments |  | 26,300 | 28,800 | $ 27,100 |
Senior Credit Facility - Revolver | Senior Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 0 | 0 |  |
Senior Credit Facility - Term Loan | Senior Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 175,000 | 247,500 |  |
5.625% Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
5.625% Senior Notes Carrying Value |  | $ 287,559 | $ 287,559 |  |
Face amount |  |  |  |  | $ 300,000
Debt instrument, interest rate |  | 5.625% |  | 5.625% | 5.625%
Debt Instrument, Maturity Date |  | Jun. 15, 2022 |  |  |
Minimum | 5.625% Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Redemption Price As Percentage Of Principal |  |  |  |  | 100.00%
Maximum | 5.625% Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Redemption Price As Percentage Of Principal |  |  |  |  | 100.90%
Senior Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior credit facility expansion option, available | $ 450,000 |  |  |  |
Number of financial covenants | covenant |  | 2 |  |  |
Senior Credit Facility | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed charge coverage ratio |  | 3.5 |  |  |
New Fixed Charge Coverage Ratio |  | 3.0 |  |  |
Senior Credit Facility | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Leverage ratio |  | 3.75 |  |  |
New Leverage Ratio |  | 4.25 |  |  |
Senior Credit Facility | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument actual interest rate |  | 3.50% |  |  |
Senior Credit Facility | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate over variable rate | 1.00% | 1.125% |  |  |
Senior Credit Facility | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate over variable rate | 2.25% | 2.00% |  |  |
Senior Credit Facility | Base Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate over variable rate | 0.00% | 1.00% |  |  |
Senior Credit Facility | Base Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate over variable rate | 1.25% | 1.25% |  |  |
Senior Credit Facility - Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 300,000 | $ 200,000 |  |  |
Debit Instrument, Prepayment, Principal |  | 23,800 |  |  |
Senior Credit Facility - Term Loan | Starting on August 30, 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Quarterly installments, payable on term loan |  | 1,250 |  |  |
Senior Credit Facility - Term Loan | Starting on May 31, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Quarterly installments, payable on term loan |  | 5,000 |  |  |
Senior Credit Facility - Revolver |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 300,000 | 400,000 |  |  |
Unused credit line |  | 398,800 |  |  |
Unused Borrowing Capacity Available for Borrowing |  | $ 287,600 |  |  |
Senior Credit Facility - Revolver | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of non-use fee, annually | 0.15% | 0.15% |  |  |
Senior Credit Facility - Revolver | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of non-use fee, annually | 0.35% | 0.30% |  |  |

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