Annual report pursuant to Section 13 and 15(d)

Defined Contribution Plans (Details) (Narrative)

v3.8.0.1
Defined Contribution Plans (Details) (Narrative) - USD ($)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Retirement Benefits [Abstract]      
Maximum allowed percentage of employee's pre-tax salary contributed to the 401(k) plan 100.00%    
Employer matching contribution, percent of match 75.00%    
Employee contribution, percent of gross pay subject to match 6.00%    
Amount of annual maximum allowed employer matching contributions per employee $ 12,150 $ 11,925 $ 11,925
Amount of the Company's contributions to the 401(k) plan $ 18,000,000 $ 16,000,000 $ 16,000,000