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Nonqualified Deferred Compensation Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Mutual funds | $ 0.0 | $ 5.6 |
Gen-Probe Incorporated [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Compensation expense for the DCP discretionary contributions | $ 37.0 | 29.4 |
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% |  |
Contributions, vesting period, years | 3 years |  |
Compensation expense for the DCP discretionary contributions | $ 3.1 | 1.8 | $ 3.7
Investment in group life insurance contracts | $ 36.0 | $ 27.5 |

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- Definition Cash surrender value of group life insurance contracts at the balance sheet date. + References No definition available. + Details
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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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