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Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | May 31, 2018 | May 31, 2018 | May 31, 2019 | Sep. 01, 2018 | Aug. 31, 2018
Basis Of Presentation [Line Items] |  |  |  |  |  |
Retained earnings |  | $ 483,243 | $ 483,243 | $ 476,580 |  | $ 484,886
ASC Topic 606 [Member] |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 485,418 |
ASU No. 2017-07 [Member] |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |
Net periodic pension cost |  | $ 100 | $ 300 |  |  |
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 |  |  |  | $ (2,500) |  | $ 532

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