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Business Segments and Geographic Information - Revenues by Geography (Detail)	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	75.10%	77.60%	78.90%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	11.70%	10.00%	10.20%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	8.60%	8.10%	7.60%
Rest of world
Schedule Of Geographical Segments [Line Items]
Revenues	4.60%	4.30%	3.30%

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- Definition

Percentage of revenues.

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- Definition

Schedule Of Geographical Segments [Line Items]

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- Details

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- Details

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