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