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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Stockholders' Equity (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
Stockholders' Equity (Details) (USD $) In Thousands	Jun. 28, 2011	Jun. 29, 2010	Jun. 28, 2011	Jun. 29, 2010	Jun. 28, 2011 Comprehensive Income (loss) [Member]	Jun. 29, 2010 Comprehensive Income (loss) [Member]	Jun. 28, 2011 Treasury Stock [Member]	Jun. 29, 2010 Treasury Stock [Member]	Jun. 28, 2011 Additional Paid-in Capital [Member]	Jun. 29, 2010 Additional Paid-in Capital [Member]	Jun. 28, 2011 Retained Earnings [Member]	Jun. 29, 2010 Retained Earnings [Member]	Jun. 28, 2011 Accumulated Other Comprehensive Income (loss) [Member]	Jun. 29, 2010 Accumulated Other Comprehensive Income (loss) [Member]	Jun. 29, 2010 Noncontrolling Interest [Member]	Jun. 28, 2011 Noncontrolling Interest [Member]	Dec. 28, 2010 Noncontrolling Interest [Member]	Jun. 28, 2011 Class A	Dec. 28, 2010 Class A	Jun. 29, 2010 Class A	Dec. 29, 2009 Class A	Jun. 28, 2011 Class B	Dec. 28, 2010 Class B	Jun. 29, 2010 Class B	Dec. 29, 2009 Class B
Summary of changes in shareholders' equity
Beginning Balance			$ 595,608	$ 597,036	$ 0	$ 0	$ (78,990)	$ (3,928)	$ 130,005	$ 168,288	$ 544,315	$ 432,449	$ 275	$ 224	$ 0	$ 0	$ 0	$ 3	$ 3	$ 3	$ 3	$ 0	$ 0	$ 0	$ 0
Comprehensive income:
Net income	35,710	26,655	68,484	52,500	68,484	52,500					68,484	52,549			(49)
Other comprehensive income:
Foreign currency translation adjustment			8	34	8	34							8	34
Total other comprehensive income			8	34	8	34
Comprehensive income			68,492	52,534	68,492	52,534
Noncontrolling interest in PB Biscuit				630											630
Issuance of common stock			976	864					976	864
Exercise of employee stock options			1,004	21,736					1,004	21,736
Stock-based compensation expense			5,140	4,684					5,140	4,684
Repurchase of common stock			(891)	71,398			(891)	510		70,888
Tax benefit from exercise of stock options			593	5,131					593	5,131
Ending Balance	$ 671,254	$ 611,217	$ 671,254	$ 611,217	$ 0	$ 0	$ (79,881)	$ (4,438)	$ 137,718	$ 129,815	$ 612,799	$ 484,998	$ 283	$ 258	$ 581	$ 0	$ 0	$ 3	$ 3	$ 3	$ 3	$ 0	$ 0	$ 0	$ 0