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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 24, 2016 | Sep. 26, 2015
Income Taxes [Line Items] |  |
Decrease in valuation allowance | $ 14,700,000 |
Federal net operating loss expected to be expired unutilized | 4,500,000 |
State net operating loss expected to be expired unutilized | 151,300,000 |
Foreign net operating loss expected to be expired unutilized | 46,500,000 |
Gross unrecognized tax benefits, excluding interest | 163,600,000 | $ 154,700,000
Unrecognized tax benefit that would impact effective tax rate | 80,100,000 | 74,900,000
Interest accrued on unrecognized tax benefits | 13,100,000 | $ 9,900,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 |
Unremitted foreign earnings | 187,600,000 |
Net Operating Losses Carryforwards [Member] |  |
Income Taxes [Line Items] |  |
Amount with unlimited carry forward periods | 44,600,000 |
Tax Credit Carryforward [Member] |  |
Income Taxes [Line Items] |  |
Amount with unlimited carry forward periods | 8,900,000 |
Maximum [Member] |  |
Income Taxes [Line Items] |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 1,000,000 |
Domestic Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses | 13,900,000 |
Credit carry forwards | 300,000 |
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses | 63,900,000 |
Credit carry forwards | 13,700,000 |
Foreign Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses | 45,000,000 |
Credit carry forwards | $ 1,600,000 |

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