Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Details Textual)

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Shareholders' Equity (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Jun. 25, 2011
Sep. 29, 2012
Sep. 24, 2011
Sep. 25, 2010
Shareholders' Equity (Textual) [Abstract]        
Repurchase of common stock   $ (20,884,000) $ (108,672,000) $ (65,810,000)
Common Stock [Member]
        
Shareholders' Equity (Textual) [Abstract]        
Common stock authorized   80,000,000    
Common stock, par value   $ 0.01    
Common stock, shares outstanding   12,247,571    
Authorized amount to repurchase stock 100,000,000 100,000,000    
Repurchase of common stock, shares   (692,300) (3,317,645) (2,529,725)
Repurchase of common stock   (7,000) (33,000) (25,000)
Aggregate stock repurchased shares   6,100,000    
Aggregate stock repurchased value   48,400,000    
Class A Common Stock [Member]
        
Shareholders' Equity (Textual) [Abstract]        
Common stock authorized   100,000,000    
Common stock, par value   $ 0.01    
Common stock, shares outstanding   34,706,902    
Number of voting powers   0    
Repurchase of common stock, shares   (1,904,700) (8,646,258) (4,273,471)
Repurchase of common stock   (19,000) (86,000) (43,000)
Class B Stock [Member]
        
Shareholders' Equity (Textual) [Abstract]        
Common stock authorized   3,000,000 3,000,000  
Common stock, par value   $ 0.01 $ 0.01  
Common stock, shares outstanding   1,652,262 1,652,262  
Percentage of vote cast for shares   49.00%    
Convertible shares conversion ratio   1    
Repurchase of common stock, shares   0    
Repurchase of common stock   $ 0 $ 0  
Maximum [Member] | Class B Stock [Member]
        
Shareholders' Equity (Textual) [Abstract]        
Number of voting powers   10    
Minimum [Member] | Class B Stock [Member]
        
Shareholders' Equity (Textual) [Abstract]        
Number of voting powers   1