CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Class A	Common Class B	Additional Paid-in Capital	Accumulated Other Comprehensive Loss, net of tax	Retained Earnings	Comprehensive Income
Beginning balance at Dec. 26, 2008	$ 140,028	$ 101	$ 41	$ 102,653	$ (431)	$ 37,664
Beginning balance (in shares) at Dec. 26, 2008		10,068,000	4,107,000
Net income	31,118					31,118	31,118
Stock options exercised, including tax benefit of $4,003 in 2011, $2,737 in 2010 and $1,705 in 2009 (in shares)		207,000
Stock options exercised, including tax benefit of $4,003 in 2011, $2,737 in 2010 and $1,705 in 2009	4,511	2		4,509
Net issuance of investment shares and restricted stock awards, net of tax benefit/deficit of $1,343 in 2011, $277 in 2010 and $65 in 2009 (in shares)		77,000
Net issuance of investment shares and restricted stock awards, net of tax benefit/deficit of $1,343 in 2011, $277 in 2010 and $65 in 2009	400			400
Stock-based compensation expense	4,106			4,106
Repurchase of Class A Common Stock ( in shares)	(208,846)	(209,000)
Repurchase of Class A Common Stock	(7,080)	(2)				(7,078)
Defined benefit plans liability adjustment, net of tax of $207 in 2011, $48 in 2010 and $50 in 2009	72				72		72
Total fiscal year comprehensive income							31,190
Ending Balance at Dec. 26, 2009	173,155	101	41	111,668	(359)	61,704
Ending Balance (in shares) at Dec. 26, 2009		10,143,000	4,107,000
Net income	50,142					50,142	50,142
Stock options exercised, including tax benefit of $4,003 in 2011, $2,737 in 2010 and $1,705 in 2009 (in shares)		197,000
Stock options exercised, including tax benefit of $4,003 in 2011, $2,737 in 2010 and $1,705 in 2009	6,398	2		6,396
Net issuance of investment shares and restricted stock awards, net of tax benefit/deficit of $1,343 in 2011, $277 in 2010 and $65 in 2009 (in shares)		50,000
Net issuance of investment shares and restricted stock awards, net of tax benefit/deficit of $1,343 in 2011, $277 in 2010 and $65 in 2009	829	1		828
Stock-based compensation expense	3,124			3,124
Repurchase of Class A Common Stock ( in shares)	(1,101,708)	(1,102,000)
Repurchase of Class A Common Stock	(67,981)	(11)				(67,970)
Defined benefit plans liability adjustment, net of tax of $207 in 2011, $48 in 2010 and $50 in 2009	(79)				(79)		(79)
Total fiscal year comprehensive income							50,063
Ending Balance at Dec. 25, 2010	165,588	93	41	122,016	(438)	43,876
Ending Balance (in shares) at Dec. 25, 2010		9,288,000	4,107,000
Net income	66,059					66,059	66,059
Stock options exercised, including tax benefit of $4,003 in 2011, $2,737 in 2010 and $1,705 in 2009 (in shares)	164,500	165,000
Stock options exercised, including tax benefit of $4,003 in 2011, $2,737 in 2010 and $1,705 in 2009	8,110	2		8,108
Net issuance of investment shares and restricted stock awards, net of tax benefit/deficit of $1,343 in 2011, $277 in 2010 and $65 in 2009 (in shares)		22,000
Net issuance of investment shares and restricted stock awards, net of tax benefit/deficit of $1,343 in 2011, $277 in 2010 and $65 in 2009	2,034			2,034
Stock-based compensation expense	6,178			6,178
Repurchase of Class A Common Stock ( in shares)	(760,036)	(760,000)
Repurchase of Class A Common Stock	(62,824)	(8)				(62,816)
Defined benefit plans liability adjustment, net of tax of $207 in 2011, $48 in 2010 and $50 in 2009	(400)				(400)		(400)
Total fiscal year comprehensive income							65,659
Ending Balance at Dec. 31, 2011	$ 184,745	$ 87	$ 41	$ 138,336	$ (838)	$ 47,119
Ending Balance (in shares) at Dec. 31, 2011		8,715,000	4,107,000