Commitments and Contingencies: (Details) (USD $)	1 Months Ended	12 Months Ended
	May 31, 2008	Jan. 03, 2012 officer Y	Dec. 28, 2010	Dec. 29, 2009	Aug. 10, 2010 employee	May 10, 2010 employee	Jul. 02, 2008 employee	Jan. 09, 2007 employee
Aggregate minimum annual lease payments under operating leases
2012		$ 66,962,000
2013		68,605,000
2014		68,988,000
2015		69,158,000
2016		68,415,000
Thereafter		605,725,000
Total minimum annual lease payments		947,853,000
Rent expense
Straight-lined minimum base rent		65,920,000	62,981,000	62,979,000
Contingent rent		19,909,000	18,696,000	17,567,000
Other charges		25,960,000	25,335,000	25,780,000
Total rent expense		111,789,000	107,012,000	106,326,000
Purchase obligations		107,800,000
Purchase obligations due in fiscal 2012		97,400,000
Outstanding standby letters of credit		18,000,000
Accrued liability for self-insured medical benefit plan		5,300,000
Threshold for certain compensation expense per year under IRS Code Section 162(m)		1,000,000
Number of current executive officers to whom compensation expense, audited by IRS, was paid		3
Number of former executive officers to whom compensation expense, audited by IRS, was paid		1
Compensation expense disallowed as per notice issued by IRS	5,100,000
Tax including interest to be refunded by IRS		1,900,000
Number of unidentified employees who alleged being subjected to hostile work environment based on national origin					15
Number of former hourly restaurant employees who filed a lawsuit, alleging violations of California's wage and hour laws								2
Number of former employees alleging engagement of the entity in a pattern and practice of sex discrimination							3
Number of former employees alleging engagement of the entity in racial discrimination							1
Number of current hourly restaurant employees who filed a class action lawsuit alleging violations of the California Labor Code						3
Payments required under event of an actual or constructive termination of employment		3,500,000
Annual founder's retirement benefit for ten years after termination of full time employment		650,000
Number of years annual founder's retirement benefit after termination of full time employment		10
Compensation expense resulting from a change in amount and structure of retirement benefit				$ 2,900,000
Minimum
Commitments and Contingencies
Operating lease remaining terms (in years)		1
Contingent rent as a percentage of sales		3.00%
Maximum
Commitments and Contingencies
Operating lease remaining terms (in years)		20
Contingent rent as a percentage of sales		10.00%