Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.5.0.2
Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granting of options 1,166,000    
Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 8.4 $ 8.3 $ 7.7
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted stock 373,000 493,000 1,021,000
Restricted Stock Awards [Member] | Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 4.5 $ 3.1 $ 3.0
Stock Options [Member] | Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2.2 3.3 2.8
401 (K) [Member] | Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1.7 $ 1.9 $ 1.9
2003 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation, number of shares 5,800,000    
2003 Plan [Member] | Preferred Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation, number of shares 500,000    
Shares reserved for outstanding equity awards 0    
Shares reserved for future awards 500,000    
2003 Plan [Member] | Class A Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation, number of shares 19,734,982    
Shares reserved for outstanding equity awards 5,100,000    
Shares reserved for future awards 10,700,000    
2003 Plan [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for outstanding equity awards 600,000    
Shares reserved for future awards 4,100,000    
Director Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granting of options 200,000    
Director Plan [Member] | Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted stock 20,000