Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock Common Shares	Common Stock Class B Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period (in shares) at Aug. 29, 2015			15,246	4,854
Balance at beginning of period at Aug. 29, 2015		$ 1,242,208	$ 1,525	$ 485	$ 67,611	$ 1,197,000	$ (24,413)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		125,026				125,026
Pension benefit liabilities, net	[1]	(3,532)					(3,532)
Change in fair value of derivatives		(613)					(613)
Foreign currency translation		(391)					(391)
Dividends declared		(2,884)				(2,884)
Share-based compensation, net (in shares)	[2]		104	(5)
Share-based compensation, net	[2]	(333)	$ 10		(343)
Share-based awards exercised, net (in shares)	[1],[3]		65
Share-based awards exercised, net	[1],[3]	5,300	$ 7		5,293
Balance at end of period (in shares) at Aug. 27, 2016			15,415	4,849
Balance at end of period at Aug. 27, 2016		1,364,781	$ 1,542	$ 485	72,561	1,319,142	(28,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		70,196				70,196
Pension benefit liabilities, net	[1]	2,774					2,774
Change in fair value of derivatives		(225)					(225)
Foreign currency translation		4,882					4,882
Dividends declared		(2,900)				(2,900)
Shares converted (in shares)			34	(34)
Shares converted		0	$ 3	$ (3)
Share-based compensation, net (in shares)	[2]		(47)
Share-based compensation, net	[2]	10,067	$ (5)		10,072
Share-based awards exercised, net (in shares)	[1],[3]		51
Share-based awards exercised, net	[1],[3]	3,617	$ 5		3,612
Balance at end of period (in shares) at Aug. 26, 2017			15,453	4,815
Balance at end of period at Aug. 26, 2017		1,453,192	$ 1,545	$ 482	86,245	1,386,438	(21,518)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		163,895				163,895
Pension benefit liabilities, net		1,342
Pension benefit liabilities, including reclassification from AOCI for tax cuts and jobs act of 2017	[1],[4]	2,534				1,192	1,342
Change in fair value of derivatives		201					201
Foreign currency translation		(5,184)					(5,184)
Dividends declared		(5,586)				(5,586)
Share-based compensation, net	[2]	1,466			2,204	(738)
Share-based awards exercised, net (in shares)	[1]		51
Share-based awards exercised, net	[1]	461	$ 5		456
Repurchase of common stock (in shares)			(73)	(1,105)
Repurchase of common stock		(146,012)	$ (7)	$ (111)	(5,932)	(139,962)
Balance at end of period (in shares) at Aug. 25, 2018			15,431	3,710
Balance at end of period at Aug. 25, 2018		$ 1,464,967	$ 1,543	$ 371	$ 82,973	$ 1,405,239	$ (25,159)

[1] These amounts are shown net of the effect of income taxes.

[2] These amounts are shown net of any shares withheld by the Company to satisfy certain tax withholdings obligations in connection with the vesting of certain shares of restricted stock.

[3] These amounts include excess tax benefits that the Company realized as part of the exercise of share-based awards.

[4] These amounts include the impact of the adoption of ASU 2018-02. See Note 1, “Summary of Significant Accounting Policies” in our Consolidated Financial Statementsfor further details.