Consolidated Statements 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. 31, 2013					$ 55			$ 14			$ 528,770	$ 1,132,868	$ (4,427)	$ (266,897)	$ 1,390,383
Balance, Shares at Aug. 31, 2013					54,634			14,141						5,341
Exchange of Class B common stock for Class A common stock, Shares					845			(845)
Exchange of Class B common stock for Class A common stock, Value					$ 1			$ (1)
Exercise of common stock options, Shares					402
Exercise of common stock options, Value											26,020				26,020
Common stock issued under associate stock purchase plan, Shares														(54)
Common stock issued under associate stock purchase plan, Value											1,992			$ 2,006	3,998
Issuance of restricted common stock, net of cancellations, Value			$ 260	$ 260
Issuance of restricted common stock, net of cancellations, Shares	99
Stock-based compensation											16,688				16,688
Purchase of treasury stock, Shares														2,370
Purchase of treasury stock, Value														$ (191,359)	(191,359)
Cash dividends on common stock						$ (64,393)	$ (64,393)		$ (18,214)	$ (18,214)
Dividend equivalent units declared												(260)			(260)
Foreign currency translation adjustment													(627)		(627)
Net income												236,067			236,067
Balance, Value at Aug. 30, 2014					$ 56			$ 13			573,730	1,286,068	(5,054)	$ (456,250)	1,398,563
Balance, Shares at Aug. 30, 2014					55,980			13,296						7,657
Exercise of common stock options, Shares					185
Exercise of common stock options, Value											14,418				14,418
Common stock issued under associate stock purchase plan, Shares														(63)
Common stock issued under associate stock purchase plan, Value											1,854			$ 2,431	4,285
Issuance of restricted common stock, net of cancellations, Value			708	708
Issuance of restricted common stock, net of cancellations, Shares	97	138
Stock-based compensation											14,195				14,195
Purchase of treasury stock, Shares														444
Purchase of treasury stock, Value														$ (33,414)	(33,414)
Cash dividends on common stock						(223,071)	$ (223,071)		(61,160)	(61,160)
Dividend equivalent units declared												(764)			(764)
Foreign currency translation adjustment													(12,198)		(12,198)
Net income												231,308			231,308
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, Value			$ 147	$ 147
Issuance of restricted common stock, net of cancellations, Shares	(15)	74
Stock-based compensation											13,985				13,985
Purchase of treasury stock, Shares														5,344
Purchase of treasury stock, Value														$ (384,111)	(384,111)
Retirement of treasury stock, Shares					(4,973)		(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												(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