Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Stock Option Awards, Additional Information (Details)

v3.19.3
Stock-Based Compensation - Stock Option Awards, Additional Information (Details)
12 Months Ended
Sep. 28, 2019
USD ($)
installment
$ / shares
Sep. 29, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of vesting installments | installment 4    
Expiration period 6 years    
Dividend during expected term (in usd per share) $ 0    
Expected life of option award 3 years 8 months 12 days 3 years 8 months 3 years 8 months
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of option award     3 years 8 months
Stock price volatility (percent) 30.40% 31.60% 31.50%
Risk free interest rate 2.50% 2.40% 2.00%
Weighted average grant date fair value of options granted (in usd per share) | $ / shares $ 7.28 $ 9.80 $ 8.14
Total intrinsic value of options exercised $ 6,700,000 $ 16,600,000 $ 44,000,000.0
Total unrecognized compensation cost $ 9,000,000.0    
Weighted average vesting period 3 years    
Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding options to purchase common stock (in usd per share) | $ / shares $ 8.56 $ 6.43 $ 6.43
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding options to purchase common stock (in usd per share) | $ / shares $ 38.10 $ 38.10 $ 33.15
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost $ 21,900,000    
Weighted average vesting period 4 years    
Selling, General and Administrative Expenses      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 14,700,000 $ 11,600,000 $ 11,100,000
Selling, General and Administrative Expenses | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 4,500,000 3,900,000 2,900,000
Selling, General and Administrative Expenses | Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 6,000,000.0 5,400,000 5,800,000
Selling, General and Administrative Expenses | 401 (K)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 4,200,000 $ 2,300,000 $ 2,400,000