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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		9 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	77.80%	75.70%	75.80%	74.80%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	11.30%	12.50%	12.20%	13.90%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	7.90%	8.00%	8.50%	7.40%
All others
Schedule Of Geographical Segments [Line Items]
Revenues	3.00%	3.80%	3.50%	3.90%

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- Definition

Percentage of revenues.

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- Definition

Schedule Of Geographical Segments [Line Items]

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