Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Shares	Class B Common Stock	Common Stock Common Shares	Common Stock Class B Common Stock	Capital Surplus	Retained Earnings		Retained Earnings Common Shares	Retained Earnings Class B Common Stock	Accumulated Other Comprehensive Loss
Balance at beginning of period (in shares) at Aug. 26, 2017					15,453	4,815
Balance at beginning 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		34,206						34,206
Change in fair value of derivatives		86										86
Foreign currency translation		(2,013)										(2,013)
Dividends declared Common Stock			$ (582)	$ (144)						$ (582)	$ (144)
Share-based compensation, net	[1]	596					1,334	(738)
Share-based awards exercised, net (in shares)	[2]				16
Share-based awards exercised, net	[2]	267			$ 2		265
Balance at end of period (in shares) at Nov. 25, 2017					15,469	4,815
Balance at end of period at Nov. 25, 2017		1,485,608			$ 1,547	$ 482	87,844	1,419,180				(23,445)
Balance at beginning of period (in shares) at Aug. 26, 2017					15,453	4,815
Balance at beginning 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		92,584
Pension benefit liabilities, net		1,192
Foreign currency translation		(763)
Balance at end of period (in shares) at Feb. 24, 2018					15,492	4,815
Balance at end of period at Feb. 24, 2018		1,544,401			$ 1,549	$ 482	87,740	1,478,030				(23,400)
Balance at beginning of period (in shares) at Nov. 25, 2017					15,469	4,815
Balance at beginning of period at Nov. 25, 2017		1,485,608			$ 1,547	$ 482	87,844	1,419,180				(23,445)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		58,378						58,378
Pension benefit liabilities, net		1,192						1,192	[3]			(1,192)	[3]
Change in fair value of derivatives		(13)										(13)
Foreign currency translation		1,250										1,250
Dividends declared Common Stock			(580)	(140)						(580)	(140)
Share-based compensation, net	[1]	(265)					(265)
Share-based awards exercised, net (in shares)	[2]				23
Share-based awards exercised, net	[2]	163			$ 2		161
Balance at end of period (in shares) at Feb. 24, 2018					15,492	4,815
Balance at end of period at Feb. 24, 2018		1,544,401			$ 1,549	$ 482	87,740	1,478,030				(23,400)
Balance at beginning of period (in shares) at Aug. 25, 2018					15,431	3,710
Balance at beginning of period at Aug. 25, 2018		1,464,967			$ 1,543	$ 371	82,973	1,405,239				(25,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		38,320						38,320
Change in fair value of derivatives		88										88
Foreign currency translation		(2,282)										(2,282)
Dividends declared Common Stock			(1,736)	(334)						(1,736)	(334)
Share-based compensation, net	[1]	1,042					1,042
Share-based awards exercised, net (in shares)	[2]				2
Balance at end of period (in shares) at Nov. 24, 2018					15,433	3,710
Balance at end of period at Nov. 24, 2018		1,539,498			$ 1,543	$ 371	84,015	1,480,922				(27,353)
Balance at beginning of period (in shares) at Aug. 25, 2018					15,431	3,710
Balance at beginning of period at Aug. 25, 2018		1,464,967			$ 1,543	$ 371	82,973	1,405,239				(25,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		85,926
Foreign currency translation		(864)
Balance at end of period (in shares) at Feb. 23, 2019					15,400	3,710
Balance at end of period at Feb. 23, 2019		1,580,790			$ 1,540	$ 371	84,454	1,520,431				(26,006)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net	[4]	39,433						39,433
Balance at beginning of period (in shares) at Nov. 24, 2018					15,433	3,710
Balance at beginning of period at Nov. 24, 2018		1,539,498			$ 1,543	$ 371	84,015	1,480,922				(27,353)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		47,606						47,606
Change in fair value of derivatives		(71)										(71)
Foreign currency translation		1,418										1,418
Dividends declared Common Stock			$ (1,732)	$ (334)						$ (1,732)	$ (334)
Share-based compensation, net	[1]	659					659
Share-based awards exercised, net (in shares)	[2]				12
Share-based awards exercised, net	[2]	26			$ 1		25
Repurchase of common stock (in shares)					(45)
Repurchase of common stock		(6,280)			$ (4)		(245)	(6,031)
Balance at end of period (in shares) at Feb. 23, 2019					15,400	3,710
Balance at end of period at Feb. 23, 2019		$ 1,580,790			$ 1,540	$ 371	$ 84,454	$ 1,520,431				$ (26,006)

[1] 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 or restricted stock units.

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

[3] These amounts include the impact of the adoption of ASU 2018-02 in the second quarter of fiscal 2018. See Note 15, “Accumulated Other Comprehensive Loss” in our Consolidated Financial Statements for further details.

[4] These amounts consist of the cumulative impact of the adoption of the new revenue recognition accounting guidance. See Note 2, “Recent Accounting Pronouncements” in the Company’s Consolidated Financial Statements.