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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	75.40%	74.90%	75.10%	75.00%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	11.30%	11.40%	12.00%	11.80%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	8.90%	9.00%	8.40%	8.50%
Rest of World
Schedule Of Geographical Segments [Line Items]
Revenues	4.40%	4.70%	4.50%	4.70%

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- Definition

Percentage of revenues.

+ References

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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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- Details

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