Consolidated Statement Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Restricted Share Awards [Member] Class A Common Stock [Member] Common Stock [Member]	Restricted Stock Units [Member] Class A Common Stock [Member] 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 Aug. 29, 2015					$ 56			$ 13			$ 604,905	$ 1,232,381	$ (17,252)	$ (487,233)	$ 1,332,870
Balance, Shares at Aug. 29, 2015					56,400			13,296						8,038
Exchange of Class B common stock for Class A common stock, shares					1,363			(1,363)
Exchange of Class B common stock for Class A common stock, value					$ 1			$ (1)
Exercise of common stock options, Shares					144
Exercise of common stock options, Value					$ 1						8,239				8,240
Common stock issued under associate stock purchase plan, Shares														(64)
Common stock issued under associate stock purchase plan, Value											1,649			$ 2,435	4,084
Issuance of restricted common stock, net of cancellations, Shares	(15)
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Value			$ 147	$ 147
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Shares		74
Stock-based compensation											13,985				13,985
Repurchases of common stock, Shares														5,344
Repurchases of common stock, Value														$ (384,111)	(384,111)
Retirement of treasury stock, Shares					(4,973)									(4,973)
Retirement of treasury stock, Value					$ (5)						(44,908)	(317,240)		$ 362,153
Cash dividends on common stock						$ (83,000)	$ (83,000)		$ (22,778)	$ (22,778)
Dividend equivalent units declared, net of cancellations												(431)			(431)
Foreign currency translation adjustment													(1,846)		(1,846)
Net income												231,216			231,216
Balance, Value at Sep. 03, 2016					$ 53			$ 12			584,017	1,040,148	(19,098)	$ (506,756)	1,098,376
Balance, Shares at Sep. 03, 2016					52,993			11,933						8,345
Exchange of Class B common stock for Class A common stock, shares					82			(82)
Exercise of common stock options, Shares					399
Exercise of common stock options, Value					$ 1						26,887				26,888
Common stock issued under associate stock purchase plan, Shares														(57)
Common stock issued under associate stock purchase plan, Value											2,088			$ 2,155	4,243
Issuance of restricted common stock, net of cancellations, Shares	(7)
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Value			$ 78	$ 78
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Shares		47
Stock-based compensation											13,925				13,925
Repurchases of common stock, Shares														685
Repurchases of common stock, Value														$ (48,869)	(48,869)
Cash dividends on common stock						(80,848)	(80,848)		(21,368)	(21,368)
Dividend equivalent units declared, net of cancellations												(551)			(551)
Foreign currency translation adjustment													1,835		1,835
Net income												231,431			231,431
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					1,396			(1,396)
Exchange of Class B common stock for Class A common stock, value					$ 2			$ (2)
Exercise of common stock options, Shares					342
Exercise of common stock options, Value											24,243				24,243
Common stock issued under associate stock purchase plan, Shares														(57)
Common stock issued under associate stock purchase plan, Value											2,307			$ 2,154	4,461
Issuance of restricted common stock, net of cancellations, Shares					(6)
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Value											222				222
Shares issued upon vesting of restricted stock units, including dividend equivalent units, Shares					83
Stock-based compensation											14,934				14,934
Repurchases of common stock, Shares														292
Repurchases of common stock, Value														$ (25,432)	(25,432)
Repurchase and retirement of common stock, Shares					(680)
Repurchase and retirement of common stock, Value					$ (1)						(10,952)	(45,984)			(56,937)
Cash dividends on common stock						$ (101,000)	$ (101,000)		$ (24,430)	$ (24,430)
Dividend equivalent units declared, net of cancellations												(799)			(799)
Foreign currency translation adjustment													(2,371)		(2,371)
Net income												329,223			329,223
Balance, Value at Sep. 01, 2018					$ 55			$ 10			$ 657,749	$ 1,325,822	$ (19,634)	$ (576,748)	$ 1,387,254
Balance, Shares at Sep. 01, 2018					54,649			10,455						9,208