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Business Segments and Geographic Information - Revenues by Geography (Detail)	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Schedule Of Geographical Segments [Line Items]
Revenues	100.00%holx_PercentageOfRevenues	100.00%holx_PercentageOfRevenues	100.00%holx_PercentageOfRevenues	100.00%holx_PercentageOfRevenues
United States
Schedule Of Geographical Segments [Line Items]
Revenues	75.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US	74.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US	75.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US	74.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US
Europe
Schedule Of Geographical Segments [Line Items]
Revenues	12.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	15.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	12.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	15.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Asia-Pacific
Schedule Of Geographical Segments [Line Items]
Revenues	9.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	7.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	9.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	7.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
All others
Schedule Of Geographical Segments [Line Items]
Revenues	4.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = holx_AllOtherCountriesMember	4.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = holx_AllOtherCountriesMember	4.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = holx_AllOtherCountriesMember	4.00%holx_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = holx_AllOtherCountriesMember

X

- Definition

Percentage of revenues.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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X

- Details

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