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Income Taxes - Additional Information (Detail) $ in Billions | Jun. 11, 2014 Subsidiary | Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($)
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Income Tax Contingency [Line Items] |  |  |
Gross unrecognized tax benefits |  | $ 7.4 | $ 6.9
Gross unrecognized tax benefits that would affect effective tax rate, if recognized |  | 2.7 | 2.5
Unrecognized tax benefits, gross interest and penalties accrued |  | $ 1.4 | $ 1.3
European Commission |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Tax Contingency, Number of Subsidiaries | Subsidiary | 2 |  |
European Commission | Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Tax Contingency, Period of Occurrence | 10 years |  |

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