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Revenue Recognition (Summary of Impacts of ASU on Condensed Consolidated Financial Statements) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Sep. 01, 2018 | Aug. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Inventories, net | $ 88,912 | $ 93,994 |  | $ 79,233
Other current assets | 8,386 | 9,461 |  | 7,204
Other current liabilities | 41,480 | 48,875 |  | 46,935
Deferred income tax liabilities | 1,048 | 1,649 |  | 1,083
Retained earnings | 483,811 | 477,584 |  | 484,886
Statement of Earnings |  |  |  |
Operating revenues | 111,951 | 124,526 |  |
Operating income | 2,040 | $ 6,201 |  |
ASC Topic 606 [Member] |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Inventories, net |  |  | $ 78,291 |
Other current assets |  |  | 8,855 |
Other current liabilities |  |  | 46,949 |
Deferred income tax liabilities |  |  | 1,246 |
Retained earnings |  |  | $ 485,418 |
ASC Topic 606 Adjustments [Member] | ASC Topic 606 [Member] |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Inventories, net | 3,669 |  |  | (942)
Other current assets | (1,059) |  |  | 1,651
Other current liabilities | 5,489 |  |  | 14
Deferred income tax liabilities |  |  |  | 163
Retained earnings | (2,879) |  |  | $ 532
Statement of Earnings |  |  |  |
Operating revenues | (6,168) |  |  |
Operating income | (3,280) |  |  |
Balance Without Adoption of ASC Topic 606 [Member] | ASC Topic 606 [Member] |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Inventories, net | 92,581 |  |  |
Other current assets | 7,327 |  |  |
Other current liabilities | 46,969 |  |  |
Retained earnings | 480,932 |  |  |
Statement of Earnings |  |  |  |
Operating revenues | 105,783 |  |  |
Operating income | $ (1,240) |  |  |

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