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Stock Compensation Plans (Details Narrative 1) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Total fair value of vested awards   $ 30,280 $ 22,429 $ 23,351
Closing stock price (in dollars per share)   $ 59.57    
Total unrecognized compensation cost related to unvested share-based compensation awards   $ 65,166    
Employee Stock Purchase Plan [Member]        
Maximum number of authorized shares available for issuance (in shares) 6,000,000      
Number of additional authorized shares issued (in shares) 2,000,000      
Purchase price of common stock (fair market value of the stock on the date of purchase) (in percent) 85.00%      
Purchase price of common stock (fair market value on the first day of the ESPP period) (in percent) 85.00%      
Number of shares purchased (in shares)   489,267 541,018 488,753
Total shares purchase price   $ 20,996 $ 18,157 $ 16,789
Number of shares available for future issuance (in shares)   970,366    
Stock Option & Stock Appreciation Rights [Member]        
Outstanding awards aggregate intrinsic values   $ 4,209    
Exercisable awards aggregate intrinsic values   3,994    
Aggregate intrinsic values   3,742 1,632 3,714
Restricted Stock Units [Member]        
Outstanding awards aggregate intrinsic values   122,885    
Aggregate intrinsic values   $ 45,424 $ 27,386 $ 20,787