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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jun. 25, 2016 | Jul. 01, 2017 | Jun. 25, 2016
Gross Unrecognized Tax Benefit [Line Items] |  |  |  |
Company's effective tax rate | 20.10% | 16.10% | 41.90% | 22.50%
Payments for Other Taxes | $ 1.7 |  |  |
Recognized Tax Benefit due to reversal of unrecognized tax benefit | 10.9 |  |  |
Provision for income taxes | 15.0 | $ 16.3 | $ 485.4 | $ 69.1
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 101.9 |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 61.7 |  |  |
Unrecognized tax benefits in the next twelve months | 20.2 |  | 20.2 |
Non-Income Tax Loss | 28.8 |  |  |
Convertible Debt Securities [Member] |  |  |  |
Gross Unrecognized Tax Benefit [Line Items] |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 64.0 |  |  |
Settlement with Taxing Authority [Member] |  |  |  |
Gross Unrecognized Tax Benefit [Line Items] |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 6.2 |  |  |
Other Settlements [Member] |  |  |  |
Gross Unrecognized Tax Benefit [Line Items] |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 8.5 |  |  |
General and administrative |  |  |  |
Gross Unrecognized Tax Benefit [Line Items] |  |  |  |
Gain from income tax settlement | $ 12.4 |  | $ 12.4 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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