Consolidated Balance Sheets (Parenthetical) (unaudited) (USD $)	Jun. 26, 2012	Dec. 27, 2011
Common stock, $.0001 par value per share:
Treasury stock, shares	2,085,236	2,048,338
Common Stock Class A [Member]
Common stock, $.0001 par value per share:
Common stock, par value	0.0001	0.0001
Common stock, shares authorized	112,500,000	112,500,000
Common stock, shares issued	30,335,327	30,330,759
Common stock, shares outstanding	28,250,091	28,265,672
Common Stock Class B [Member]
Common stock, $.0001 par value per share:
Common stock, par value	0.0001	0.0001
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	1,383,687	1,383,687
Common stock, shares outstanding	1,383,687	1,383,687
Preferred Stock [Member]
Common stock, $.0001 par value per share:
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