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Deferred Compensation Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Gen-Probe Incorporated [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Compensation expense for the DCP discretionary contributions | $ 51.9 | $ 49.8 |
Nonqualified Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Maximum employee contributions from base salary, percentage | 75.00% |  |
Maximum employee contributions from annual bonus, percentage | 100.00% |  |
Employee contributions vested, percentage | 100.00% |  |
Percent vested annually | 33.33% |  |
Compensation expense for the DCP discretionary contributions | $ 2.7 | 2.9 | $ 3.4
Investment in group life insurance contracts | $ 44.6 | $ 44.2 |
Nonqualified Deferred Compensation Plan [Member] | One Third Annually [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Contributions, vesting period, years | 3 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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