CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive Income (loss)	Non-controlling Interest
Beginning Balance at Dec. 26, 2009	$ 268,151	$ 663	$ 161,261	$ 766,040	$ (660,446)	$ 498	$ 135
Beginning Balance (in shares) at Dec. 26, 2009		66,255,358			16,022,111
Net income	86,582			87,514			(932)
Dividends paid	(9,422)			(9,422)
Purchases of common stock (in shares)					2,652,791
Purchases of common stock	(102,736)				(102,736)
Exercises of stock options and issuances net of forfeitures and vesting of non-vested stock, including excess tax effect (in shares)		279,811
Exercises of stock options and issuances net of forfeitures and vesting of non-vested stock, including excess tax effect	3,240	2	3,238
Stock-based compensation	4,769		4,769
Foreign currency translation	182					182
Unrealized gain on available-for-sale investments, net of income taxes	201					201
Ending Balance at Dec. 25, 2010	250,967	665	169,268	844,132	(763,182)	881	(797)
Ending Balance (in shares) at Dec. 25, 2010		66,535,169			18,674,902
Net income	112,945			113,007			(62)
Dividends paid	(9,983)			(9,983)
Purchases of common stock (in shares)					1,206,111
Purchases of common stock	(50,450)				(50,450)
Purchase of noncontrolling interest	(8,000)		(8,859)				859
Exercises of stock options and issuances net of forfeitures and vesting of non-vested stock, including excess tax effect (in shares)		67,317			1,276
Exercises of stock options and issuances net of forfeitures and vesting of non-vested stock, including excess tax effect	240	1	291		(52)
Stock-based compensation	5,012		5,012
Foreign currency translation	(171)					(171)
Unrealized gain on available-for-sale investments, net of income taxes	17					17
Ending Balance at Dec. 31, 2011	300,577	666	165,712	947,156	(813,684)	727
Ending Balance (in shares) at Dec. 31, 2011		66,602,486			19,882,289
Net income	129,781			129,781
Dividends paid	(33,981)			(33,981)
Purchases of common stock (in shares)					524,674
Purchases of common stock	(25,826)				(25,826)
Exercises of stock options and issuances net of forfeitures and vesting of non-vested stock, including excess tax effect (in shares)		257,378			4,773
Exercises of stock options and issuances net of forfeitures and vesting of non-vested stock, including excess tax effect	2,111	3	2,115		(7)
Stock-based compensation	6,149		6,149
Foreign currency translation	243					243
Unrealized gain on available-for-sale investments, net of income taxes	400					400
Ending Balance at Dec. 29, 2012	$ 379,454	$ 669	$ 173,976	$ 1,042,956	$ (839,517)	$ 1,370
Ending Balance (in shares) at Dec. 29, 2012		66,859,864			20,411,736