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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016
Income Taxes [Line Items] |  |
Decrease in valuation allowance | $ 18,000,000 |
Federal net operating loss expected to be expired unutilized | 4,500,000 |
State net operating loss expected to be expired unutilized | 117,900,000 |
Foreign net operating loss expected to be expired unutilized | 45,400,000 |
Gross unrecognized tax benefits, excluding interest | 90,300,000 | $ 163,600,000
Unrecognized tax benefit that would impact effective tax rate | 70,300,000 | 76,900,000
Unrecognized tax benefits, period decrease | 73,300,000 |
Interest accrued on unrecognized tax benefits | 5,300,000 | $ 13,100,000
Income tax penalties accrued | 0 |
Payments for other taxes | 1,700,000 |
Recognized tax benefit due to reversal of unrecognized tax benefit | 10,900,000 |
Unremitted foreign earnings | 309,500,000 |
Non-income tax loss | 35,600,000 |
General and Administrative Expense [Member] |  |
Income Taxes [Line Items] |  |
Income tax refund | (12,400,000) |
Convertible Debt Securities [Member] |  |
Income Taxes [Line Items] |  |
Unrecognized tax benefits, period decrease | (64,000,000) |
Settlement with Taxing Authority [Member] |  |
Income Taxes [Line Items] |  |
Unrecognized tax benefits, period decrease | (9,300,000) |
Net Operating Losses Carryforwards [Member] |  |
Income Taxes [Line Items] |  |
Amount with unlimited carry forward periods | 33,700,000 |
Tax Credit Carryforward [Member] |  |
Income Taxes [Line Items] |  |
Amount with unlimited carry forward periods | 2,200,000 |
Maximum |  |
Income Taxes [Line Items] |  |
Decrease in unrecognized tax benefits is reasonably possible | 2,000,000 |
Domestic Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses | 64,300,000 |
Credit carry forwards | 5,200,000 |
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses | 91,400,000 |
Credit carry forwards | 10,300,000 |
Foreign Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses | 36,500,000 |
Credit carry forwards | $ 5,800,000 |

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