Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Additional Information 1 (Detail)

v3.5.0.2
Stock-Based Compensation - Additional Information 1 (Detail)
1 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
Employees
Sep. 24, 2016
USD ($)
Installment
$ / shares
shares
Sep. 26, 2015
USD ($)
$ / shares
shares
Sep. 27, 2014
USD ($)
$ / shares
shares
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Sep. 27, 2008
Sep. 28, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of shares covered by performance-based awards (percent) 20.00%                
Number of affected employees | Employees 250                
Recorded additional compensation cost $ 0                
Unvested options | shares   0              
Dividend during expected term (in usd per share) | $ / shares   $ 0              
Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of options granted (percent)         0.00% 20.00% 60.00% 100.00%  
Stock Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of vesting installments | Installment   4              
Expiration period approximately   6 years              
Expected life of option award     3 years 7 months 6 days 3 years 6 months          
Stock price volatility (percent)   30.80% 30.30% 34.30%          
Risk free interest rates (percent)     1.30% 1.60%          
Weighted average grant date fair value of options granted (in usd per share) | $ / shares   $ 3.04 $ 2.51 $ 1.93          
Total intrinsic value of options exercised   $ 22,600,000 $ 5,900,000 $ 1,400,000          
Total unrecognized compensation cost related to nonvested stock options   $ 5,200,000              
Nonvested stock options remaining weighted average vesting period   2 years              
Stock Options [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Outstanding options to purchase common stock (in usd per share) | $ / shares   $ 6.43 $ 6.43 $ 6.43          
Stock Options [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Outstanding options to purchase common stock (in usd per share) | $ / shares   $ 15.56 $ 15.00 $ 16.23          
Restricted Stock Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total unrecognized compensation cost related to nonvested stock options   $ 11,200,000              
Nonvested stock options remaining weighted average vesting period   2 years              
Restricted stock awards outstanding, shares | shares   1,540,000 1,550,000 1,609,000         894,000
Bonus earned in vested shares       $ 6,400,000          
Share based payment award, shares granted and vested | shares       570,000          
Restricted Stock Awards [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share based payment award vesting conditional period of employment   4 years              
Restricted Stock Awards [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share based payment award vesting conditional period of employment   5 years