Condensed Consolidated Statement Of Shareholders' Equity - 6 months ended Mar. 03, 2018 - USD ($) shares in Thousands, $ in Thousands	Restricted Stock Units [Member] Class A Common Stock [Member]	Restricted Stock Units [Member] Additional Paid-In Capital [Member]	Restricted Stock Units [Member]	Class A Common Stock [Member] Common Stock [Member]	Class A Common Stock [Member] Retained Earnings [Member]	Class A Common Stock [Member]	Class B Common Stock [Member] Common Stock [Member]	Class B Common Stock [Member] Retained Earnings [Member]	Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Class A Treasury Stock [Member]	Total
Balance, Value at Sep. 02, 2017				$ 54			$ 12			$ 626,995	$ 1,168,812	$ (17,263)	$ (553,470)	$ 1,225,140
Balance, Shares at Sep. 02, 2017						53,514			11,851				8,973
Exchange of Class B common stock for Class A common stock, shares						1,227			(1,227)
Exchange of Class B common stock for Class A common stock, value				1			(1)
Exercise of common stock options, Shares						232
Exercise of common stock options, Value										16,393				16,393
Common stock issued under associate stock purchase plan, Shares													(30)
Common stock issued under associate stock purchase plan, Value										1,251			$ 1,125	2,376
Issuance of restricted common stock, net of cancellations, Shares						(3)
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Value		$ 212	$ 212
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Shares	80
Stock-based compensation										7,589				7,589
Repurchases of common stock, Shares													249
Repurchases of common stock, Value													$ (21,728)	(21,728)
Net income											177,137			177,137
Cash dividends on common stock					$ (47,687)	$ (47,687)		$ (12,186)	$ (12,186)
Dividend equivalent units declared, net of cancellations											(395)			(395)
Foreign currency translation adjustment												(816)		(816)
Balance, Value at Mar. 03, 2018				$ 55			$ 11			$ 652,440	$ 1,285,681	$ (18,079)	$ (574,073)	$ 1,346,035
Balance, Shares at Mar. 03, 2018						55,050			10,624				9,192