Consolidated Balance Sheets Balance Sheet Parenthetical - $ / shares	Dec. 27, 2016	Dec. 29, 2015
Capital Unit [Line Items]
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Treasury Stock, Shares	9,333,391	7,490,481
Common Class B [Member]
Capital Unit [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	1,381,730	1,381,730
Common Stock, Shares, Outstanding	1,381,730	1,381,730
Common Class A [Member]
Capital Unit [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	112,500,000	112,500,000
Common Stock, Shares, Issued	30,910,395	30,836,669
Common Stock, Shares, Outstanding	21,577,004	23,346,188
Preferred Stock [Member]
Capital Unit [Line Items]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (in shares)	2,000,000	2,000,000