Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.3.1.900
Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granting of options 1,361,000    
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of restricted stock 493,000 1,021,000 552,000
Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 8.3 $ 7.7 $ 15.9
Selling, General and Administrative Expenses [Member] | Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 3.1 3.0 11.2
Selling, General and Administrative Expenses [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 3.3 2.8 2.7
Selling, General and Administrative Expenses [Member] | 401 (K) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1.9 $ 1.9 $ 2.0
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] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation, number of shares 5,800,000    
Shares reserved for outstanding equity awards 1,500,000    
Shares reserved for future awards 3,400,000    
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    
Increased authorized shares for issuance 9,734,982    
Shares reserved for outstanding equity awards 6,300,000    
Shares reserved for future awards 10,300,000    
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