Stock-Based Compensation - Weighted-Average Assumptions Utilized to Value Stock Options (Detail) (Employee Stock Purchase Plan [Member], USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.30%	0.50%	1.20%	0.50%
Expected volatility	41.40%	43.70%		43.70%
Expected life (in years)	4 years 5 months 24 days	4 years 4 months 24 days	4 years 4 months 24 days	4 years 4 months 24 days
Dividend yield	$ 0	$ 0	$ 0	$ 0
Weighted average fair value of options granted	$ 7.97	$ 7.47	$ 7.64	$ 7.09