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Share-Based Compensation Plans - Weighted Average Assumptions used for Calculating Fair Value of Stock Options Granted (Detail) - $ / shares	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	3 years
Stock Options with Market-based Vesting Criteria
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	3 years 10 months 24 days	3 years 4 months 24 days	7 years
Target price	$ 53.87	$ 98.99	$ 67.39
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	3 years 3 months 29 days
Expected dividends	0.00%

X

- Definition

Target price per share for recognition of any remaining unamortized compensation cost.

+ References

No definition available.

+ Details

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X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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