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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	77.90%	78.40%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	10.70%	10.00%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	8.40%	7.90%
All others
Schedule Of Geographical Segments [Line Items]
Revenues	3.00%	3.70%

X

- Definition

Percentage of revenues.

+ References

No definition available.

+ Details

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- Definition

Schedule Of Geographical Segments [Line Items]

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No definition available.

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- Details

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- Details

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X

- Details

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X

- Details

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