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Summary of Significant Accounting Policies - Property, Plant and Equipment Narrative (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 15, 2020 | Sep. 28, 2020 | Apr. 01, 2023 | Sep. 28, 2024 | Sep. 30, 2023 | Sep. 24, 2022
Accounting Policies [Abstract] |  |  |  |  |  |
Grants received from Department of Defense | $ 119,300,000 | $ 7,600,000 |  |  |  |
Proceeds from the Department of Defense |  |  | $ 20,500,000 | $ 0 | $ 20,500,000 | $ 75,000,000.0
Department of Defense funds received |  |  |  |  |  | 75,000,000
Department of Defense funds received, not capitalized |  |  |  |  |  | $ 7,600,000

X
- Definition Department of defense funds received + References No definition available. + Details
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- Definition Department of Defense funds received, not capitalized + References No definition available. + Details
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- Definition Grants received from Department of defense + References No definition available. + Details
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- Definition Proceeds received from government grants for capacity expansion + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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