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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended
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Oct. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Sep. 04, 2012 | Dec. 29, 2012 Adiana, Inc. [Member] | Dec. 29, 2012 Sentinelle Medical Inc. [Member] | Mar. 30, 2013 Interlace Business. [Member] | Jun. 28, 2014 Interlace Business. [Member] | Jun. 30, 2011 TCT International Co., Ltd. [Member] | Dec. 28, 2013 TCT International Co., Ltd. [Member] | Sep. 28, 2013 TCT International Co., Ltd. [Member]
Contingent Consideration Earn-Out Payments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of contingent consideration |  |  |  | $ 0 | $ 42.4 |  | $ 16.8 | $ 3.4 | $ 86.9 |  |  | $ 31.1 | $ 87.4
Contingent payments period |  |  |  |  |  |  |  |  |  | 2 years | 2 years |  |
Contingent consideration – fair value adjustments |  |  |  |  |  |  |  |  | 93.8 |  |  |  |
Accrued contingent payments |  |  |  |  |  |  |  |  |  | 3.1 |  |  |
Contingent consideration – compensation expense |  | 0 | 21.6 | 0 | 80.5 |  |  |  |  |  |  |  |
Assessed damages |  |  |  |  |  | 4.0 |  |  |  |  |  |  |
Additional Payments | $ 14.7 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Accrued contingent earn out amount. + References No definition available. + Details
Name: | holx_AccruedContingentEarnOutAmount
Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount assessed in damages. + References No definition available. + Details
Name: | holx_AmountAssessedInDamages
Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Business acquisition contingent consideration payment period. + References No definition available. + Details
Name: | holx_BusinessAcquisitionContingentConsiderationPaymentPeriod
Namespace Prefix: | holx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + 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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- Definition Represents the amount of contingent consideration expense recorded in the respective reporting period. + References No definition available. + Details
Name: | holx_ContingentConsiderationCompensationExpense
Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Loss contingency damages sought related to additional contingent consideration under merger and acquisition agreement. + References No definition available. + Details
Name: | holx_LossContingencyDamagesSoughtRelatedToAdditionalContingentConsiderationUnderMergerAndAcquisitionAgreement
Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the cash payment of contingent consideration to the former shareholders of the acquired company. + References No definition available. + Details
Name: | holx_PaymentOfContingentConsideration
Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration