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Supplemental Guarantor Condensed Consolidating Financials - Schedule of Supplemental Condensed Consolidating Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 28, 2015
Sep. 27, 2014
Mar. 29, 2014
Sep. 28, 2013
Current assets:        
Cash and cash equivalents $ 670.5us-gaap_CashAndCashEquivalentsAtCarryingValue $ 736.1us-gaap_CashAndCashEquivalentsAtCarryingValue $ 484.5us-gaap_CashAndCashEquivalentsAtCarryingValue $ 822.5us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 4.6us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 5.5us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue    
Accounts receivable, net 381.0us-gaap_AccountsReceivableNetCurrent 396.0us-gaap_AccountsReceivableNetCurrent    
Inventories 298.2us-gaap_InventoryNet 330.6us-gaap_InventoryNet    
Deferred income tax assets 0us-gaap_DeferredTaxAssetsNetCurrent 39.4us-gaap_DeferredTaxAssetsNetCurrent    
Prepaid income taxes 21.1us-gaap_PrepaidTaxes 22.4us-gaap_PrepaidTaxes    
Prepaid expenses and other current assets 40.9us-gaap_PrepaidExpenseCurrent 35.8us-gaap_PrepaidExpenseCurrent    
Intercompany receivables 0holx_IntercompanyReceivables 0holx_IntercompanyReceivables    
Total current assets 1,416.3us-gaap_AssetsCurrent 1,565.8us-gaap_AssetsCurrent    
Property, plant and equipment, net 451.0us-gaap_PropertyPlantAndEquipmentNet 461.9us-gaap_PropertyPlantAndEquipmentNet    
Intangible assets, net 3,225.8us-gaap_IntangibleAssetsNetExcludingGoodwill 3,433.6us-gaap_IntangibleAssetsNetExcludingGoodwill    
Goodwill 2,809.1us-gaap_Goodwill 2,810.8us-gaap_Goodwill    
Other assets 129.6us-gaap_OtherAssetsNoncurrent 142.6us-gaap_OtherAssetsNoncurrent    
Long term intercompany receivables 0holx_IntercompanyNotesReceivable 0holx_IntercompanyNotesReceivable    
Investment in subsidiaries 0holx_InvestmentInSubsidiaries 0holx_InvestmentInSubsidiaries    
Total assets 8,031.8us-gaap_Assets 8,414.7us-gaap_Assets    
Current liabilities:        
Current portion of long-term debt 581.7us-gaap_LongTermDebtCurrent 114.5us-gaap_LongTermDebtCurrent    
Accounts payable 73.7us-gaap_AccountsPayableCurrent 92.1us-gaap_AccountsPayableCurrent    
Accrued expenses 217.8us-gaap_AccruedLiabilitiesCurrent 262.1us-gaap_AccruedLiabilitiesCurrent    
Deferred revenue 156.5us-gaap_DeferredRevenueCurrent 150.9us-gaap_DeferredRevenueCurrent    
Deferred Tax Liabilities, Net, Current 14.5us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent    
Intercompany payables 0holx_IntercompanyPayables 0holx_IntercompanyPayables    
Total current liabilities 1,044.2us-gaap_LiabilitiesCurrent 619.6us-gaap_LiabilitiesCurrent    
Long-term debt, net of current portion 3,358.1us-gaap_LongTermDebtNoncurrent 4,153.2us-gaap_LongTermDebtNoncurrent    
Deferred income tax liabilities 1,243.5us-gaap_DeferredTaxLiabilitiesNoncurrent 1,375.4us-gaap_DeferredTaxLiabilitiesNoncurrent    
Deferred revenue 17.6us-gaap_DeferredRevenueNoncurrent 20.1us-gaap_DeferredRevenueNoncurrent    
Long-term intercompany payables 0holx_IntercompanyNotesPayables 0holx_IntercompanyNotesPayables    
Other long-term liabilities 199.8us-gaap_OtherLiabilitiesNoncurrent 183.4us-gaap_OtherLiabilitiesNoncurrent    
Total stockholders’ equity 2,168.6us-gaap_StockholdersEquity 2,063.0us-gaap_StockholdersEquity    
Total liabilities and stockholders’ equity 8,031.8us-gaap_LiabilitiesAndStockholdersEquity 8,414.7us-gaap_LiabilitiesAndStockholdersEquity    
Eliminations        
Current assets:        
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Accounts receivable, net 0us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Inventories 0us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred income tax assets (11.2)us-gaap_DeferredTaxAssetsNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_DeferredTaxAssetsNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Prepaid income taxes (0.3)us-gaap_PrepaidTaxes
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1.1)us-gaap_PrepaidTaxes
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Prepaid expenses and other current assets 0us-gaap_PrepaidExpenseCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PrepaidExpenseCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany receivables (2,861.9)holx_IntercompanyReceivables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,720.2)holx_IntercompanyReceivables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets (2,873.4)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,721.3)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Property, plant and equipment, net 0us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Intangible assets, net (10.5)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(10.7)us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Goodwill 0us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Other assets 0us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Long term intercompany receivables (13.0)holx_IntercompanyNotesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(13.0)holx_IntercompanyNotesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Investment in subsidiaries (8,555.3)holx_InvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(8,747.7)holx_InvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets (11,452.2)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(11,492.7)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Current liabilities:        
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_LongTermDebtCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Accounts payable 0us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Accrued expenses (0.3)us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1.1)us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred revenue 0us-gaap_DeferredRevenueCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_DeferredRevenueCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred Tax Liabilities, Net, Current (11.2)us-gaap_DeferredTaxLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
     
Intercompany payables (2,862.2)holx_IntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,720.4)holx_IntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current liabilities (2,873.7)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,721.5)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Long-term debt, net of current portion 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred income tax liabilities 0us-gaap_DeferredTaxLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_DeferredTaxLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred revenue 0us-gaap_DeferredRevenueNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_DeferredRevenueNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Long-term intercompany payables (13.0)holx_IntercompanyNotesPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(13.0)holx_IntercompanyNotesPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Other long-term liabilities 0us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total stockholders’ equity (8,565.5)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(8,758.2)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities and stockholders’ equity (11,452.2)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(11,492.7)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Parent/Issuer        
Current assets:        
Cash and cash equivalents 370.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
288.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
139.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
321.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accounts receivable, net 125.3us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
128.4us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inventories 90.7us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
88.6us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income tax assets 0us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
26.2us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Prepaid income taxes 18.3us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20.3us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Prepaid expenses and other current assets 22.6us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16.2us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany receivables 0holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets 627.8us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
567.8us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property, plant and equipment, net 26.8us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
29.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intangible assets, net 22.2us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25.1us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Goodwill 328.5us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
282.4us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 80.4us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
88.4us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long term intercompany receivables 0holx_IntercompanyNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0holx_IntercompanyNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries 8,342.7holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,526.0holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 9,428.4us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,519.4us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current liabilities:        
Current portion of long-term debt 581.7us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
114.5us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accounts payable 28.8us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
34.8us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued expenses 119.0us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
139.4us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred revenue 118.6us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
113.5us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred Tax Liabilities, Net, Current 25.7us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Intercompany payables 2,820.2holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,676.2holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current liabilities 3,694.0us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,078.4us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term debt, net of current portion 3,358.1us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,153.2us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income tax liabilities 50.5us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
90.9us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred revenue 7.9us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8.3us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term intercompany payables 13.0holx_IntercompanyNotesPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13.0holx_IntercompanyNotesPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other long-term liabilities 136.3us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
112.6us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total stockholders’ equity 2,168.6us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,063.0us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and stockholders’ equity 9,428.4us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,519.4us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Guarantor Subsidiaries        
Current assets:        
Cash and cash equivalents 148.2us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
287.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
242.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
387.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accounts receivable, net 178.0us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
182.5us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories 163.8us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
190.1us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred income tax assets 10.2us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12.1us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Prepaid income taxes 3.1us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3.2us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Prepaid expenses and other current assets 9.5us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11.0us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany receivables 2,850.8holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,702.1holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets 3,363.6us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,388.8us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property, plant and equipment, net 336.1us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
337.1us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intangible assets, net 3,175.1us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,377.3us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Goodwill 2,390.4us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,390.9us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other assets 47.9us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
52.7us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long term intercompany receivables 0holx_IntercompanyNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0holx_IntercompanyNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investment in subsidiaries 212.6holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
221.7holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets 9,525.7us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
9,768.5us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current liabilities:        
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accounts payable 33.4us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
46.1us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued expenses 59.8us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
69.5us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred revenue 10.2us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
7.4us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred Tax Liabilities, Net, Current 0us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
     
Intercompany payables 0holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current liabilities 103.4us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
123.0us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term debt, net of current portion 0us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred income tax liabilities 1,189.2us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,279.1us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred revenue 3.8us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3.6us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term intercompany payables 0holx_IntercompanyNotesPayables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0holx_IntercompanyNotesPayables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other long-term liabilities 29.1us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
34.3us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total stockholders’ equity 8,200.2us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
8,328.5us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities and stockholders’ equity 9,525.7us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
9,768.5us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Non-Guarantor Subsidiaries        
Current assets:        
Cash and cash equivalents 151.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
160.2us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
102.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
113.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Restricted cash 4.6us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5.5us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accounts receivable, net 77.7us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
85.1us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Inventories 43.7us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
51.9us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred income tax assets 1.0us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1.1us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Prepaid income taxes 0us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Prepaid expenses and other current assets 8.8us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8.6us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany receivables 11.1holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
18.1holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current assets 298.3us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
330.5us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Property, plant and equipment, net 88.1us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
95.1us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intangible assets, net 39.0us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
41.9us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Goodwill 90.2us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
137.5us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other assets 1.3us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1.5us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long term intercompany receivables 13.0holx_IntercompanyNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
13.0holx_IntercompanyNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investment in subsidiaries 0holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total assets 529.9us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
619.5us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Current liabilities:        
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accounts payable 11.5us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11.2us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accrued expenses 39.3us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
54.3us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred revenue 27.7us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
30.0us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred Tax Liabilities, Net, Current 0us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Intercompany payables 42.0holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
44.2holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current liabilities 120.5us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
139.7us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-term debt, net of current portion 0us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred income tax liabilities 3.8us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5.4us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred revenue 5.9us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8.2us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-term intercompany payables 0holx_IntercompanyNotesPayables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0holx_IntercompanyNotesPayables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other long-term liabilities 34.4us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
36.5us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total stockholders’ equity 365.3us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
429.7us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total liabilities and stockholders’ equity $ 529.9us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
$ 619.5us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember