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Commitments and Contingencies: (Details) (USD $)
 12 Months Ended
Jan. 01, 2013
Jan. 03, 2012
Dec. 28, 2010
Aggregate minimum annual lease payments under operating leases      
2013 $ 69,812,000    
2014 69,638,000    
2015 69,808,000    
2016 69,066,000    
2017 68,181,000    
Thereafter 569,545,000    
Total 916,050,000    
Rent expense      
Straight-lined minimum base rent 68,524,000 65,920,000 62,981,000
Contingent rent 20,104,000 19,909,000 18,696,000
Other charges 28,039,000 25,960,000 25,335,000
Total 116,667,000 111,789,000 107,012,000
Purchase obligations 97,900,000    
Purchase obligations due in fiscal 2013 88,700,000    
Outstanding standby letters of credit 22,000,000    
Accrued liability for self-insured medical benefit plan 4,900,000 5,300,000  
Payments required under event of an actual or constructive termination of employment 2,300,000    
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 years    
Compensation expense resulting from an extension of CEO's employment agreement $ 800,000    
Minimum
      
Commitments and Contingencies      
Operating lease remaining terms, excluding unexercised renewal options 1 year    
Contingent rent as a percentage of sales 3.00%    
Maximum
      
Commitments and Contingencies      
Operating lease remaining terms, excluding unexercised renewal options 20 years    
Contingent rent as a percentage of sales 10.00%