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New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Sep. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  | $ 474,740 | $ 484,886 |  |
Net periodic pension cost |  | 445 | 449 | $ 477 |
ASU 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Right of use asset |  | 25,600 |  |  |
Lease liability |  | 29,400 |  |  |
ASC Topic 606 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | $ 485,418
ASC Topic 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  | $ (3,153) | 532 |  |
ASU No. 2017-07 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Net periodic pension cost |  |  | $ 400 | $ 400 |
ASU No. 2018-02 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Tax reclassification from accumulated other comprehensive income to retained earnings due to tax reform | $ 500 |  |  |  |

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