Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Aug. 31, 2013

Accounting Policies [Abstract]

Estimated Useful Lives Of Property Plant And Equipment [Table Text Block]

Buildings (in years)	30	-	40
Building components (in years)	10	-	20
Leasehold improvements	Shorter of useful life or term of lease
Machinery and equipment (in years)	3	-	10
Motor vehicles (in years)	3	-	5

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Fiscal year ended August	2013			2012			2011
Risk-free interest rate		1.24	%		1.54	%		1.98	%
Expected dividend yield		0.41	%		0.56	%		0.60	%
Expected life in years		7.42			7.39			7.32
Expected volatility		33.4	%		33.8	%		34.8	%

Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]

Year ended	August 31, 2013		August 25, 2012		August 27, 2011
Net income available to shareholders	$	116,685	$	94,989	$	76,486
Allocation of net income for Basic:
Common Stock	$	91,916	$	74,643	$	59,944
Class B Common Stock		22,913		18,630		15,104
Unvested participating shares		1,856		1,716		1,438
	$	116,685	$	94,989	$	76,486
Weighted average number of shares for Basic:
Common Stock		14,975		14,882		14,791
Class B Common Stock		4,666		4,643		4,658
Unvested participating shares		345		391		405
		19,986		19,916		19,854
Earnings per share for Basic:
Common Stock	$	6.14	$	5.02	$	4.05
Class B Common Stock	$	4.91	$	4.01	$	3.24

Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]

	Year Ended August 31, 2013							Year Ended August 25, 2012							Year Ended August 27, 2011
	Earnings to Common shareholders			Common Shares		EPS		Earnings to Common shareholders			Common Shares		EPS		Earnings to Common shareholders			Common Shares		EPS
As reported - Basic	$	91,916			14,975	$	6.14	$	74,643			14,882	$	5.02	$	59,944			14,791	$	4.05
Add: effect of dilutive potential common shares
Share-Based Awards		—			148				—			91				—			83
Class B Common Stock		22,913			4,666				18,630			4,643				15,104			4,658
Add: Undistributed earnings allocated to unvested  participating shares		1,810			—				1,664			—				1,385			—
Less: Undistributed earnings reallocated to unvested participating shares		(1,712	)		—				(1,579	)		—				(1,315	)		—
Diluted EPS – Common Stock	$	114,927			19,789	$	5.81	$	93,358			19,616	$	4.76	$	75,118			19,532	$	3.85