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Business Segments and Geographic Information - Revenues by Geography (Detail) | 12 Months Ended
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Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 100.00% | 100.00% | 100.00%
United States |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 77.60% | 78.90% | 76.00%
Europe |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 10.00% | 10.20% | 11.80%
Asia-Pacific |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 8.10% | 7.60% | 8.50%
Rest of world |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 4.30% | 3.30% | 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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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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