Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 15, 2019	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Class of Stock [Line Items]
Shares of preferred stock authorized for issuance		14,000,000
Preferred stock issued		0	0
Preferred stock outstanding		0	0
Number of common stock shares purchased		5,000
Cost of common stock shares purchased		$ 200
Number of shares withheld for minimum statutory taxes		109,896	561	104,699
Values of withheld shares		$ 3,700	$ 12	$ 2,000
Stock repurchased during period, shares	40,000,000
Knowledge Capital [Member]
Class of Stock [Line Items]
Number of common stock shares purchased		284,608