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Business Segments and Geographic Information - Revenues by Geography (Detail) | 12 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 75.00% | 75.00% | 74.00%
Europe [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 13.00% | 13.00% | 12.00%
Asia-Pacific [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 8.00% | 8.00% | 8.00%
All Others [Member] |  |  |
Schedule Of Geographical Segments [Line Items] |  |  |
Revenues | 4.00% | 4.00% | 6.00%

X
- Definition Percentage of revenues. + References No definition available. + Details
Name: | holx_PercentageOfRevenues
Namespace Prefix: | holx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | holx_ScheduleOfGeographicalSegmentsLineItems
Namespace Prefix: | holx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration