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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 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	74.50%	79.70%	75.00%	78.90%
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	12.60%	9.70%	12.00%	10.10%
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	7.90%	6.50%	8.30%	7.40%
Rest of World
Schedule Of Geographical Segments [Line Items]
Revenues	5.00%	4.10%	4.70%	3.60%

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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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