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v3.20.2

Deferred Compensation Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Deferred Compensation Liability, Current and Noncurrent | $ 57,700,000 | $ 51,900,000 |
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 | $ 3,100,000 | 2,700,000 | $ 2,900,000
Investment in group life insurance contracts | $ 49,300,000 | $ 44,600,000 |
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 Employee contributions vested, percentage. + References No definition available. + Details
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- Definition Employer Contributions, Percent Vested Annually + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The vesting period for discretionary employer contributions, which vest ratably on an annual basis. + References No definition available. + Details
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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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Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
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- Definition Maximum employee contributions from annual bonus percentage to dcp. + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Maximum employee contributions from base salary percentage to dcp. + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Nonqualified deferred compensation plan annual contribution. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Data Type: | xbrli:stringItemType
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
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- Details
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Period Type: |