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Share-Based Compensation Plans - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 27, 2019
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 1,408
Granted (in shares) | shares 585
Exercised (in shares) | shares (119)
Forfeited, canceled or expired (in shares) | shares (1,497)
Ending balance (in shares) | shares 376
Weighted-Average Exercise Price per Share  
Beginning balance (in USD per share) | $ / shares $ 32.05
Granted (in USD per share) | $ / shares 15.44
Exercised (in USD per share) | $ / shares 13.48
Forfeited, canceled or expired (in USD per share) | $ / shares 31.68
Ending balance (in USD per share) | $ / shares $ 13.58
Options Outstanding, Additional Disclosures  
Weighted-Average Remaining Contractual Term (in Years) 7 years 10 days
Aggregate Intrinsic Value | $ $ 3,046
Options Vested and Expected to Vest  
Number of shares (in shares) | shares 376
Weighted-Average Exercise Price Per Share (in USD per share) | $ / shares $ 13.58
Weighted-Average Remaining Contractual Term (in Years) 7 years 10 days
Aggregate Intrinsic Value | $ $ 3,046
Options Exercisable  
Number of Shares (in shares) | shares 91
Weighted-Average Exercise Price per Share (in USD per share) | $ / shares $ 9.82
Weighted-Average Remaining Contractual Term (in Years) 2 years 5 months 23 days
Aggregate Intrinsic Value | $ $ 1,081