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Stock-Based Compensation - Weighted-Average Assumptions Utilized to Value Stock Options (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Risk-free interest rate   1.80% 2.10% 1.80%
Expected volatility   36.50% 35.30% 36.60%
Expected life (in years)   4 years 8 months 8 days 4 years 8 months 8 days 4 years 8 months
Dividend yield   $ 0 $ 0 $ 0
Weighted average fair value of options granted   $ 14.40 $ 12.98 $ 12.33
Number of option granted (in shares) 0