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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Sep. 30, 2017 USD ($) Lease term | Sep. 24, 2016 USD ($) | Sep. 26, 2015 USD ($)
Contingent Consideration Earn-Out Payments [Line Items] |  |  |
Accrued expenses | $ 375.3 | $ 287.6 |
Operating lease expiration year | 2035 |  |
Rent expense net of sublease income | $ 19.3 | 17.9 | $ 19.2
Rent expense on sublease rentals | $ 2.3 | $ 2.4 | $ 2.0
Finance Leases [Member] |  |  |
Contingent Consideration Earn-Out Payments [Line Items] |  |  |
Number of finance leases | Lease | 2 |  |
Fair value | $ 28.3 |  |
Finance lease extension executed | 1 |  |
Finance lease expiration year | 2024 |  |
Accrued expenses | $ 3.2 |  |
Accrued lease obligation-long-term | $ 34.1 |  |
Optional lease extension period | 10 years |  |
Number of optional lease extensions | term | 2 |  |
Lease extension period | 5 years |  |
Finance Lease 2 [Member] |  |  |
Contingent Consideration Earn-Out Payments [Line Items] |  |  |
Optional lease extension period | 8 years |  |
Number of optional lease extensions | term | 1 |  |
Lease extension period | 5 years |  |
Finance Leases [Member] | Leasehold Improvements [Member] |  |  |
Contingent Consideration Earn-Out Payments [Line Items] |  |  |
Property, plant and equipment, estimated useful life | 35 years |  |

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