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Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 27, 2021 | Apr. 08, 2020 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Gain on sale of business |  |  | $ 1,087 | $ 0 | $ (301)
Net of cash acquired, paid in cash |  |  | 0 | 3,034 | 0
Goodwill |  |  | 67,968 | 68,004 | $ 64,387
Net Irrigate, LLC [Member] |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Acquisition date |  | Apr. 08, 2020 |  |  |
Total purchase price |  | $ 4,500 |  |  |
Net of cash acquired, paid in cash |  | 3,000 |  |  |
Cash payable |  | $ 300 |  |  |
Cash payable period |  | 1 year |  |  |
Earn-out payment amount |  | $ 1,200 | 300 | $ 1,100 |
Earn-out liability payment period |  | 1 year |  |  |
Maximum potential payout |  | $ 1,500 |  |  |
Goodwill |  | 3,200 |  |  |
Business combination, various other assets and liabilities |  | $ 1,300 |  |  |
IRZ Consulting, LLC [Member] |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Proceeds from sale of businesses | $ 3,400 |  |  |  |
Proceeds from sale of businesses in cash | 1,300 |  |  |  |
Proceeds from sale in short-term notes | $ 2,100 |  |  |  |
IRZ Consulting, LLC [Member] | General and Administrative Expense [Member] |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Gain on sale of business |  |  | $ 1,100 |  |

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