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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Apr. 01, 2017	Mar. 26, 2016	Apr. 01, 2017	Mar. 26, 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	79.70%	79.00%	78.90%	78.70%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	9.70%	10.40%	10.10%	10.20%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	6.50%	7.40%	7.40%	7.60%
All others
Schedule Of Geographical Segments [Line Items]
Revenues	4.10%	3.20%	3.60%	3.50%

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- Definition

Percentage of revenues.

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- Definition

Schedule Of Geographical Segments [Line Items]

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