Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2019	Dec. 01, 2018
Components Of Shareholders Equity [Line Items]
Shares repurchased by the company for associates' tax withholding liability associated with share-based compensation		40
Treasury stock reissued to fund plan, shares	16	13
Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Common stock shares repurchased	41	778
Purchase of treasury stock	$ 3,009	$ 63,527
Number of shares authorized for repurchase	1,157
Treasury Stock [Member] | Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Purchase of treasury stock	$ 3,009	$ 3,200