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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. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options granted (in shares)	1.0	1.7	1.0
Weighted-average exercise price	$ 41.36	$ 40.76	$ 38.07
Weighted average grant date fair value (in usd per share)	$ 13.54	$ 12.98	$ 12.33
Assumptions:
Risk-free interest rates	3.00%	2.10%	1.80%
Expected life (in years)	4 years 9 months 18 days	4 years 8 months 12 days	4 years 8 months 12 days
Expected volatility	34.30%	35.30%	36.60%
Dividend yield	$ 0.0	$ 0.0	$ 0.0

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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Weighted average grant-date fair value of non-vested options outstanding.

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