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Stockholders' Equity and Stock-Based Compensation - Information Pertaining to Stock Options Granted and Related Assumptions (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	1.3	2.4	2.6
Weighted-average exercise price	$ 27.68	$ 22.01	$ 20.29
Weighted-average grant date fair value	$ 9.95	$ 7,670	$ 7,030
Assumptions:
Risk-free interest rates	1.70%	1.20%	0.50%
Expected life (in years)	5 years 4 months 6 days	4 years 4 months 24 days	4 years 4 months 24 days
Expected volatility	38.60%	41.40%	43.70%
Dividend yield	$ 0.0	$ 0.0	$ 0.0

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Per Share

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



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Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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Weighted average expected volatility rate of share-based compensation awards.

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Net number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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