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Supplemental Guarantor Condensed Consolidating Financials - Schedule of Consolidating Statement of Cash Flows (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
OPERATING ACTIVITIES    
Net cash provided by (used in) operating activities $ 153.5us-gaap_NetCashProvidedByUsedInOperatingActivities $ 149.3us-gaap_NetCashProvidedByUsedInOperatingActivities
INVESTING ACTIVITIES    
Net proceeds from sale of business 0holx_ProceedsFromSaleOfBusiness 2.4holx_ProceedsFromSaleOfBusiness
Purchase of property and equipment (10.8)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (8.4)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Increase in equipment under customer usage agreements (10.3)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements (8.0)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
Net sales of insurance contracts (6.4)us-gaap_PaymentsForProceedsFromLifeInsurancePolicies 13.8us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
Purchases of mutual funds 0us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment 29.7us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
Sales of mutual funds 6.4us-gaap_ProceedsFromPaymentsForTradingSecurities 15.9us-gaap_ProceedsFromPaymentsForTradingSecurities
(Increase) decrease in other assets (0.9)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (0.4)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Net cash used in investing activities (22.0)us-gaap_NetCashProvidedByUsedInInvestingActivities (14.4)us-gaap_NetCashProvidedByUsedInInvestingActivities
FINANCING ACTIVITIES    
Repayment of long-term debt (328.8)us-gaap_RepaymentsOfLongTermDebt (521.3)us-gaap_RepaymentsOfLongTermDebt
Net proceeds from issuance of common stock pursuant to employee stock plans 15.2us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 12.9us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Excess tax benefit related to equity awards 3.0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3.0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payment of minimum tax withholdings on net share settlements of equity awards (10.6)holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits (9.1)holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
Net cash used in financing activities (321.2)us-gaap_NetCashProvidedByUsedInFinancingActivities (514.5)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (2.4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (0.4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash and cash equivalents (192.1)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (380.0)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 736.1us-gaap_CashAndCashEquivalentsAtCarryingValue 822.5us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 544.0us-gaap_CashAndCashEquivalentsAtCarryingValue 442.5us-gaap_CashAndCashEquivalentsAtCarryingValue
Eliminations    
OPERATING ACTIVITIES    
Net cash provided by (used in) operating activities 0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
INVESTING ACTIVITIES    
Net proceeds from sale of business   0holx_ProceedsFromSaleOfBusiness
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Purchase of property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Increase in equipment under customer usage agreements 0holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net sales of insurance contracts 0us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Purchases of mutual funds   0us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Sales of mutual funds 0us-gaap_ProceedsFromPaymentsForTradingSecurities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProceedsFromPaymentsForTradingSecurities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(Increase) decrease in other assets 0us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net cash used in investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
FINANCING ACTIVITIES    
Repayment of long-term debt 0us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net proceeds from issuance of common stock pursuant to employee stock plans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Excess tax benefit related to equity awards 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Payment of minimum tax withholdings on net share settlements of equity awards 0holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net cash used in financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net decrease in cash and cash equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents, beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents, end of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Parent/Issuer    
OPERATING ACTIVITIES    
Net cash provided by (used in) operating activities 186.9us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
301.6us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
INVESTING ACTIVITIES    
Net proceeds from sale of business   0holx_ProceedsFromSaleOfBusiness
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Purchase of property and equipment (2.4)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2.9)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Increase in equipment under customer usage agreements 0holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(0.4)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net sales of insurance contracts (6.4)us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13.8us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Purchases of mutual funds   29.7us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Sales of mutual funds 6.4us-gaap_ProceedsFromPaymentsForTradingSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15.9us-gaap_ProceedsFromPaymentsForTradingSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(Increase) decrease in other assets (0.8)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0.1us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in investing activities (3.2)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3.2)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
FINANCING ACTIVITIES    
Repayment of long-term debt (328.8)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(521.3)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net proceeds from issuance of common stock pursuant to employee stock plans 15.2us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12.9us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefit related to equity awards 3.0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3.0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Payment of minimum tax withholdings on net share settlements of equity awards (10.6)holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(9.1)holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in financing activities (321.2)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(514.5)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net decrease in cash and cash equivalents (137.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(216.1)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of period 288.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
321.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period 150.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
105.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor Subsidiaries    
OPERATING ACTIVITIES    
Net cash provided by (used in) operating activities (25.9)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(142.0)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
INVESTING ACTIVITIES    
Net proceeds from sale of business   0holx_ProceedsFromSaleOfBusiness
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Purchase of property and equipment (5.6)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3.2)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Increase in equipment under customer usage agreements (6.5)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(4.3)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net sales of insurance contracts 0us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Purchases of mutual funds   0us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Sales of mutual funds 0us-gaap_ProceedsFromPaymentsForTradingSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromPaymentsForTradingSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(Increase) decrease in other assets (0.1)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1.0)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash used in investing activities (12.2)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(8.5)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
FINANCING ACTIVITIES    
Repayment of long-term debt 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net proceeds from issuance of common stock pursuant to employee stock plans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Excess tax benefit related to equity awards 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Payment of minimum tax withholdings on net share settlements of equity awards 0holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash used in financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Effect of exchange rate changes on cash and cash equivalents (0.3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net decrease in cash and cash equivalents (38.4)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(150.4)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period 287.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
387.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, end of period 249.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
237.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries    
OPERATING ACTIVITIES    
Net cash provided by (used in) operating activities (7.5)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(10.3)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
INVESTING ACTIVITIES    
Net proceeds from sale of business   2.4holx_ProceedsFromSaleOfBusiness
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Purchase of property and equipment (2.8)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2.3)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Increase in equipment under customer usage agreements (3.8)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(3.3)holx_PaymentsToManufactureEquipmentUnderCustomerUsageAgreements
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net sales of insurance contracts 0us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsForProceedsFromLifeInsurancePolicies
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Purchases of mutual funds   0us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Sales of mutual funds 0us-gaap_ProceedsFromPaymentsForTradingSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromPaymentsForTradingSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(Increase) decrease in other assets 0us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0.5us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash used in investing activities (6.6)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2.7)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
FINANCING ACTIVITIES    
Repayment of long-term debt 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net proceeds from issuance of common stock pursuant to employee stock plans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Excess tax benefit related to equity awards 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Payment of minimum tax withholdings on net share settlements of equity awards 0holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0holx_PaymentForTaxWithholdingRelatedToVestedAndReleasedRestrictedStockUnits
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash used in financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Effect of exchange rate changes on cash and cash equivalents (2.1)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(0.5)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net decrease in cash and cash equivalents (16.2)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(13.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period 160.2us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
113.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, end of period $ 144.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
$ 100.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember