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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Mar. 26, 2016	Mar. 28, 2015
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	79.00%	75.50%	78.70%	74.80%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	10.40%	11.80%	10.20%	12.70%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	7.40%	8.90%	7.60%	8.80%
All others
Schedule Of Geographical Segments [Line Items]
Revenues	3.20%	3.80%	3.50%	3.70%

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- Definition

Percentage of revenues.

+ References

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- Definition

Schedule Of Geographical Segments [Line Items]

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- Details

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