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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	76.00%	75.10%	75.10%	75.00%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	14.80%	12.50%	13.80%	12.30%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	5.50%	7.90%	7.00%	8.10%
Rest of World
Schedule Of Geographical Segments [Line Items]
Revenues	3.70%	4.50%	4.10%	4.60%

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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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- Details

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