Consolidated Statements of Changes in Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Comprehensive Income [Member]	Common Stock [Member] Common Stock Class A [Member]	Common Stock [Member] Common Stock Class B [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 30, 2008	$ 498,686		$ 3	$ 0	$ (2,204)	$ 151,358	$ 346,399	$ (394)	$ 3,524
Beginning Balance, Shares (in shares) at Dec. 30, 2008			29,422,000	1,398,000	136,000
Comprehensive income:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	86,851	86,851				0	86,050	0	801
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	618	618				0	0	618	0
Total other comprehensive income loss	618	618
Comprehensive income	87,469	87,469
Purchase of Noncontrolling Interest	(23,124)					(18,799)	0	0	(4,325)
Adjustments to Noncontrolling Interest	(742)					(742)	0	0	0
Issuance of common stock	1,626		0	0	0	1,626	0	0	0
Issuance of common stock, Shares (in shares)			36,000	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0		0	0	0	0	0	0	0
Stock Issued During Period, Restricted Stock Award (in shares)			165,000	0	0
Exercise of employee stock options	22,818		0	0	0	22,818	0	0	0
Exercise of employee stock options, Shares (in shares)			628,000	0	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	8,661					8,661	0	0	0
Stock Issued During Period, Value, Conversion of Convertible Securities	0		0	0	0	0	0	0	0
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)			6,000	(6,000)	0
Repurchase of common stock	(3,453)		0	0	(1,724)	(1,729)	0	0	0
Treasury Stock, Shares, Acquired (in shares)			(60,000)	0	32,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	5,095					5,095	0	0	0
Ending Balance at Dec. 29, 2009	597,036		3	0	(3,928)	168,288	432,449	224	0
Ending Balance, Shares (in shares) at Dec. 29, 2009			30,197,000	1,392,000	168,000
Comprehensive income:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	111,599	111,599				0	111,866	0	(267)
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	64	64				0	0	51	13
Total other comprehensive income loss	64	64
Comprehensive income	111,663	111,663
Noncontrolling Interest in PB Biscuit	630					0	0	0	630
Purchase of Noncontrolling Interest	(743)					(367)	0	0	(376)
Issuance of common stock	1,802		0	0	0	1,802	0	0	0
Issuance of common stock, Shares (in shares)			28,000	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0		0	0	0	0	0	0	0
Stock Issued During Period, Restricted Stock Award (in shares)			132,000	0	0
Exercise of employee stock options	25,551		0	0	0	25,551	0	0	0
Exercise of employee stock options, Shares (in shares)			599,000	0	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	9,558					9,558	0	0	0
Repurchase of common stock	(153,492)		0	0	(75,062)	(78,430)	0	0	0
Treasury Stock, Shares, Acquired (in shares)			(1,949,000)	0	951,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	3,603					3,603	0	0	0
Ending Balance at Dec. 28, 2010	595,608		3	0	(78,990)	130,005	544,315	275	0
Ending Balance, Shares (in shares) at Dec. 28, 2010			29,007,000	1,392,000	1,119,000
Comprehensive income:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	135,952	135,952				0	135,952	0
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	33	33				0	0	33	0
Total other comprehensive income loss	33	33
Comprehensive income	135,985	135,985
Issuance of common stock	2,040		0	0	0	2,040	0	0	0
Issuance of common stock, Shares (in shares)			21,000	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0		0	0	0	0	0	0	0
Stock Issued During Period, Restricted Stock Award (in shares)			93,000	0	0
Exercise of employee stock options	3,193		0	0	0	3,193	0	0	0
Exercise of employee stock options, Shares (in shares)			65,000	0	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	9,861					9,861	0	0	0
Stock Issued During Period, Value, Conversion of Convertible Securities	0		0	0	0	0	0	0	0
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)			8,000	(8,000)	0
Exercise of SSARs, shares			1,000
Repurchase of common stock	(96,605)		0	0	(96,605)	0	0	0	0
Treasury Stock, Shares, Acquired (in shares)			(929,000)		929,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	4,994					4,994	0	0	0
Ending Balance at Dec. 27, 2011	$ 655,076		$ 3	$ 0	$ (175,595)	$ 150,093	$ 680,267	$ 308	$ 0
Ending Balance, Shares (in shares) at Dec. 27, 2011			28,266,000	1,384,000	2,048,000