Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Additional Information 1 (Detail)

v3.3.1.900
Stock-Based Compensation - Additional Information 1 (Detail)
 1 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
Employees
Sep. 26, 2015
USD ($)
Installment
$ / shares
shares
Sep. 27, 2014
USD ($)
$ / shares
shares
Sep. 28, 2013
USD ($)
$ / shares
shares
Sep. 25, 2010
Sep. 26, 2009
Sep. 27, 2008
Sep. 29, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of affected employees | Employees 250              
Percentage of shares covered by performance-based awards 20.00%              
Recorded additional compensation cost $ 0              
Unvested options   $ 3,300,000            
Options subject to performance based vesting criteria   $ 300,000            
Dividend during expected term | $ / shares   $ 0            
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 3 years 6 months        
Stock price volatility   30.30% 34.30% 34.80%        
Risk free interest rates   1.30% 1.60% 1.20%        
Weighted average grant date fair value of options granted | $ / shares   $ 2.51 $ 1.93 $ 1.72        
Total intrinsic value of options exercised   $ 5,900,000 $ 1,400,000 $ 1,100,000        
Total unrecognized compensation cost related to nonvested stock options   $ 4,800,000            
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 | $ / shares   $ 6.43 $ 6.43 $ 4.60        
Stock Options [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Outstanding options to purchase common stock | $ / shares   $ 15.00 $ 16.23 $ 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   $ 10,500,000            
Nonvested stock options remaining weighted average vesting period   2 years            
Restricted stock awards outstanding, shares | shares   1,550,000 1,609,000 894,000       785,000
Share based payment award vesting conditional period of employment   5 years            
Bonus earned in vested shares   $ 6,400,000            
Share based payment award, shares granted and vested | shares   570,000            
Granted, Weighted Average Grant Date Fair Value per Share | $ / shares   $ 10.55 $ 7.98 $ 9.26        
Aggregate fair value as of the vesting date of restricted shares   $ 3,200,000 $ 1,700,000 $ 3,400,000        
Performance Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of options granted         20.00% 60.00% 100.00%