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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 No definition available. + Details
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- Definition Schedule Of Geographical Segments [Line Items] + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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