Consolidated Balance Sheets (Parenthetical) (unaudited) (USD $)	Jun. 25, 2013	Dec. 25, 2012
Common stock, $.0001 par value per share:
Treasury stock, shares	2,374,525	2,249,554
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	30,467,996	30,458,238
Common stock, shares outstanding	28,093,471	28,208,684
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	1,383,020	1,383,687
Common stock, shares outstanding	1,383,020	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