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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%	100.00%	100.00%	100.00%
United States
Schedule Of Geographical Segments [Line Items]
Revenues	74.90%	76.70%	75.00%	78.10%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	11.40%	9.40%	11.80%	9.90%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	9.00%	8.70%	8.50%	7.90%
Rest of World
Schedule Of Geographical Segments [Line Items]
Revenues	4.70%	5.20%	4.70%	4.10%

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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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