Annual report pursuant to Section 13 and 15(d)

Other Employee Benefit Plans (Details) (Narrative)

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Other Employee Benefit Plans (Details) (Narrative) - USD ($)
12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Defined Contribution Plan Disclosure [Line Items]      
Maximum allowed percentage of employee's pre-tax salary contributed to the 401(k) plan 100.00%    
Employer matching contribution, percent of match 6.00%    
Amount of annual maximum allowed employer matching contributions per employee $ 11,925 $ 11,700 $ 11,475
Amount of the Company's contributions to the 401(k) plan $ 16,000,000 $ 18,000,000 $ 19,000,000