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Consolidated Balance Sheets Balance Sheet Parenthetical - $ / shares
Mar. 28, 2017
Dec. 27, 2016
Capital Unit [Line Items]    
Treasury Stock, Shares 9,574,186 9,333,391
Common Class A [Member]    
Capital Unit [Line Items]    
Common Stock, Shares Authorized 112,500,000 112,500,000
Common Stock, Shares, Issued 30,911,302 30,910,395
Common Stock, Par or Stated Value Per Share $ 0.0001 $ 0.0001
Common Stock, Shares, Outstanding 21,337,116 21,577,004
Common Class B [Member]    
Capital Unit [Line Items]    
Common Stock, Shares Authorized 10,000,000 10,000,000
Common Stock, Shares, Issued 1,381,730 1,381,730
Common Stock, Par or Stated Value Per Share $ 0.0001 $ 0.0001
Common Stock, Shares, Outstanding 1,381,730 1,381,730
Preferred Stock [Member]    
Capital Unit [Line Items]    
Preferred Stock, Par or Stated Value Per Share $ 0.0001 $ 0.0001
Preferred Stock, Shares Authorized 2,000,000 2,000,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Outstanding 0 0