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Stock-Based Compensation - Weighted-Average Assumptions Utilized to Value Stock Options (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 1.70% 1.30% 1.70% 1.20%
Expected volatility 38.60% 41.40% 38.60% 41.40%
Expected life (in years) 5 years 4 months 4 years 6 months 5 years 4 months 4 years 5 months
Dividend yield $ 0 $ 0 $ 0 $ 0
Weighted average fair value of options granted $ 12.07 $ 7.97 $ 9.73 $ 7.64