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Stockholders' Equity and Stock-Based Compensation - Assumptions to Value Stock Options (Detail) - USD ($)	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
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
ESPP
Assumptions:
Risk-free interest rates	2.27%	1.62%	0.72%
Expected life (in years)	15 days	15 days	15 days
Expected volatility	27.10%	25.00%	24.90%
Dividend yield	$ 0	$ 0	$ 0

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- Definition

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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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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