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Business Segments and Geographic Information - Revenues by Geography (Detail)	12 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%
United States [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	78.90%	76.00%	75.10%
Europe [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	10.20%	11.80%	13.30%
Asia-Pacific [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	7.60%	8.50%	7.70%
All Others [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	3.30%	3.70%	3.90%

X

- 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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X

- Details

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X

- Details

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X

- Details

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