Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Additional Information (Detail)

v2.4.0.8
Shareholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Jun. 25, 2011
Sep. 28, 2013
Sep. 29, 2012
Sep. 24, 2011
Repurchase of common stock   $ 1,503,000 $ 20,884,000 $ 108,672,000
Class B Stock [Member]
        
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 0 0
Repurchase of common stock   0 0 0
Common Stock [Member]
        
Common stock authorized   80,000,000    
Common stock, par value   $ 0.01    
Common stock, shares outstanding   12,246,751    
Authorized amount to repurchase stock 100,000,000 100,000,000    
Repurchase of common stock, shares   0 692,300 3,317,645
Repurchase of common stock   0 7,000 33,000
Aggregate stock repurchased shares   6,300,000    
Aggregate stock repurchased value   49,900,000    
Class A Common Stock [Member]
        
Common stock authorized   100,000,000    
Common stock, par value   $ 0.01    
Common stock, shares outstanding   35,291,001    
Repurchase of common stock, shares   165,900 1,904,700 8,646,258
Repurchase of common stock   $ 1,000 $ 19,000 $ 86,000
Maximum [Member] | Class B Stock [Member]
        
Number of voting powers   10    
Minimum [Member] | Class B Stock [Member]
        
Number of voting powers   1