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Business Segments and Geographic Information - Revenues by Geography (Detail) | 12 Months Ended
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Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 78.90% | 76.00% | 75.10%
Europe [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 10.20% | 11.80% | 13.30%
Asia-Pacific [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 7.60% | 8.50% | 7.70%
All Others [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 3.30% | 3.70% | 3.90%

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- Definition Percentage of revenues. + 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 Schedule Of Geographical Segments [Line Items] + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |