Note 7 - Net Income Per Share (Tables)

6 Months Ended

Feb. 28, 2015

Earnings Per Share [Abstract]

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

	Thirteen weeks ended				Twenty-six weeks ended
	February 28,		March 1,		February 28,		March 1,
	2015		2014		2015		2014
Net income	$	25,446	$	25,647	$	62,859	$	60,109
Allocation of net income for Basic:
Common Stock	$	20,182	$	20,267	$	49,834	$	47,479
Class B Common Stock		5,041		5,041		12,472		11,836
Unvested participating shares		223		339		553		794
	$	25,446	$	25,647	$	62,859	$	60,109
Weighted average number of shares for Basic:
Common Stock		15,185		15,077		15,156		15,053
Class B Common Stock		4,741		4,687		4,741		4,690
Unvested participating shares		192		288		192		288
		20,118		20,052		20,089		20,031
Earnings per share for Basic:
Common Stock	$	1.33	$	1.34	$	3.29	$	3.15
Class B Common Stock	$	1.06	$	1.08	$	2.63	$	2.52

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

	Thirteen weeks							Twenty-six weeks
	ended February 28, 2015							ended February 28, 2015
	Earnings							Earnings
	to Common			Common				to Common			Common
	Shareholders			Shares		EPS		Shareholders			Shares		EPS
As reported - Basic	$	20,182			15,185	$	1.33	$	49,834			15,156	$	3.29
Add: effect of dilutive potential common shares
Share-based awards		—			139				—			131
Class B Common Stock		5,041			4,741				12,472			4,741
Add: Undistributed earnings allocated to unvested participating shares		217			—				540			—
Less: Undistributed earnings reallocated to unvested participating shares		(205	)		—				(511	)		—
Diluted EPS – Common Stock	$	25,235			20,065	$	1.26	$	62,335			20,028	$	3.11

	Thirteen weeks							Twenty-six weeks
	ended March 1, 2014							ended March 1, 2014
	Earnings							Earnings
	to Common			Common				to Common			Common
	Shareholders			Shares		EPS		Shareholders			Shares		EPS
As reported - Basic	$	20,267			15,077	$	1.34	$	47,479			15,053	$	3.15
Add: effect of dilutive potential common shares
Share-based awards		—			160				—			154
Class B Common Stock		5,041			4,687				11,836			4,690
Add: Undistributed earnings allocated to unvested participating shares		329			—				776			—
Less: Undistributed earnings reallocated to unvested participating shares		(311	)		—				(734	)		—
Diluted EPS – Common Stock	$	25,326			19,924	$	1.27	$	59,357			19,897	$	2.98