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Deferred Compensation Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Gen-Probe Incorporated [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Compensation expense for the DCP discretionary contributions | $ 43.2 | $ 37.0 |
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% |  |
Contributions, vesting period, years | 3 years |  |
Compensation expense for the DCP discretionary contributions | $ 3.4 | 3.1 | $ 1.8
Investment in group life insurance contracts | $ 41.0 | $ 36.0 |
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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