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Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2018 | Sep. 01, 2018 | Aug. 31, 2018 | Nov. 30, 2017
Basis Of Presentation [Line Items] |  |  |  |
Retained earnings | $ 483,811 |  | $ 484,886 | $ 477,584
ASC Topic 606 [Member] |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Retained earnings |  | $ 485,418 |  |
ASU No. 2018-02 [Member] |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Tax reclassification from accumulated other comprehensive income to retained earnings due to tax reform | 500 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASC Topic 606 [Member] |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Retained earnings | $ (2,879) |  | $ 532 |

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