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Business Segments and Geographic Information - Revenues by Geography (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 26, 2016 | Mar. 28, 2015 | Mar. 26, 2016 | Mar. 28, 2015
Schedule Of Geographical Segments [Line Items] |  |  |  |
Revenues | 100.00% | 100.00% | 100.00% | 100.00%
United States |  |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |  |
Revenues | 79.00% | 75.50% | 78.70% | 74.80%
Europe |  |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |  |
Revenues | 10.40% | 11.80% | 10.20% | 12.70%
Asia-Pacific |  |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |  |
Revenues | 7.40% | 8.90% | 7.60% | 8.80%
All others |  |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |  |
Revenues | 3.20% | 3.80% | 3.50% | 3.70%

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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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