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v3.19.3

Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Sep. 28, 2019 USD ($) Lease term | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($)
Contingent Consideration Earn-Out Payments [Line Items] |  |  |
Accrued expenses | $ 430.9 | $ 436.1 |
Rent expense net of sublease income | 23.1 | 23.1 | $ 19.3
Rent expense on sublease rentals | $ 2.7 | $ 2.6 | $ 2.3
Finance Leases [Member] |  |  |
Contingent Consideration Earn-Out Payments [Line Items] |  |  |
Number of finance leases | Lease | 2 |  |
Fair value | $ 28.3 |  |
Accrued expenses | 1.6 |  |
Accrued lease obligation-long-term | $ 33.6 |  |
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 | 6 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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