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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	69.20%	76.00%	70.00%	75.10%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	21.90%	14.80%	21.40%	13.80%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	5.90%	5.50%	5.70%	7.00%
Rest of World
Schedule Of Geographical Segments [Line Items]
Revenues	3.00%	3.70%	2.90%	4.10%

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- Definition

Percentage of revenues.

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- Definition

Schedule Of Geographical Segments [Line Items]

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