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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	76.70%	78.70%	78.10%	78.70%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	9.40%	10.60%	9.90%	10.30%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	8.70%	7.50%	7.90%	7.60%
All others
Schedule Of Geographical Segments [Line Items]
Revenues	5.20%	3.20%	4.10%	3.40%

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- Definition

Percentage of revenues.

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- Definition

Schedule Of Geographical Segments [Line Items]

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