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Acquisitions and Divestitures (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 08, 2020 USD ($) | Feb. 29, 2020 USD ($) | May 31, 2020 USD ($) | May 31, 2019 USD ($) | Aug. 31, 2019 USD ($) | Aug. 31, 2018 Facility
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |
Net of cash acquired, paid in cash |  |  | $ 3,034 | $ 0 |  |
Goodwill |  |  | 67,635 | 64,454 | $ 64,387 |
Loss on sale of irrigation dealership |  |  | 0 | 301 |  |
Note receivable from sale of business |  |  | 0 | 5,589 |  |
Assets held-for-sale |  |  | 0 | 2,744 | $ 2,744 |
Net proceeds from the sale of building |  | $ 3,900 | 3,955 | 0 |  |
Gain from the sale of building |  | $ 1,200 | $ 1,191 | 0 |  |
North America [Member] | Infrastructure [Member] |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |
Number of manufacturing facilities closed | Facility |  |  |  |  |  | 1
General and Administrative Expense [Member] |  |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |  |
Loss on sale of irrigation dealership |  |  |  | $ 300 |  |
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 | 90 days |  |  |  |  |
Earn-out liability payment period | 1 year |  |  |  |  |
Earn-out payment amount | $ 1,200 |  |  |  |  |
Maximum potential payout | 1,500 |  |  |  |  |
Goodwill | 3,200 |  |  |  |  |
Business combination, various other assets and liabilities | $ 1,300 |  |  |  |  |

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