Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Detail)

v3.8.0.1
Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Number of Shares      
Beginning Balance, Outstanding, Number of Shares 4,169    
Granted, Number of Shares 639    
Exercised, Number of Shares (2,234)    
Cancelled or expired, Number of Shares (103)    
Ending Balance, Outstanding, Number of Shares 2,471 4,169  
Weighted Average Exercise Price per Share      
Beginning Balance, Outstanding, Weighted Average Exercise Price per share (in usd per share) $ 11.64    
Granted, Weighted Average Exercise Price per share (in usd per share) 31.02    
Exercised, Weighted Average Exercise Price per share (in usd per share) 11.51    
Cancelled or expired, Weighted Average Exercise Price per share (in usd per share) 11.33    
Ending Balance, Outstanding, Weighted Average Exercise Price per share (in usd per share) $ 16.79 $ 11.64  
Exercisable, Number of Shares 458 1,732 2,910
Expected to vest, Number of Shares 1,767    
Exercised, Weighted Average Exercise Price per share (in usd per share) $ 10.80 $ 11.46 $ 10.74
Expected to vest, Weighted Average Exercise Price per share (in usd per share) $ 18.15    
Outstanding, Weighted Average Remaining Contractual Life 4 years 3 years  
Exercisable, Weighted Average Remaining Contractual Life 2 years 2 years 2 years
Expected to vest, Weighted Average Remaining Contractual Life 4 years    
Outstanding, Aggregate Intrinsic Value $ 50,420 $ 53,705  
Exercisable, Aggregate Intrinsic Value 12,097 $ 22,954 $ 17,226
Expected to Vest, Aggregate Intrinsic Value $ 33,644