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Supplemental Guarantor Condensed Consolidating Financials - Schedule of Supplemental Condensed Consolidating Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 27, 2014
Sep. 27, 2014
Dec. 28, 2013
Sep. 28, 2013
Current assets:        
Cash and cash equivalents $ 544.0us-gaap_CashAndCashEquivalentsAtCarryingValue $ 736.1us-gaap_CashAndCashEquivalentsAtCarryingValue $ 442.5us-gaap_CashAndCashEquivalentsAtCarryingValue $ 822.5us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 5.1us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 5.5us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue    
Accounts receivable, net 400.5us-gaap_AccountsReceivableNetCurrent 396.0us-gaap_AccountsReceivableNetCurrent    
Inventories 310.3us-gaap_InventoryNet 330.6us-gaap_InventoryNet    
Deferred income tax assets 39.0us-gaap_DeferredTaxAssetsNetCurrent 39.4us-gaap_DeferredTaxAssetsNetCurrent    
Prepaid income taxes 0us-gaap_PrepaidTaxes 22.4us-gaap_PrepaidTaxes    
Prepaid expenses and other current assets 37.7us-gaap_PrepaidExpenseCurrent 35.8us-gaap_PrepaidExpenseCurrent    
Intercompany receivables 0holx_IntercompanyReceivables 0holx_IntercompanyReceivables    
Total current assets 1,336.6us-gaap_AssetsCurrent 1,565.8us-gaap_AssetsCurrent    
Property, plant and equipment, net 458.2us-gaap_PropertyPlantAndEquipmentNet 461.9us-gaap_PropertyPlantAndEquipmentNet    
Intangible assets, net 3,332.1us-gaap_IntangibleAssetsNetExcludingGoodwill 3,433.6us-gaap_IntangibleAssetsNetExcludingGoodwill    
Goodwill 2,809.9us-gaap_Goodwill 2,810.8us-gaap_Goodwill    
Other assets 141.3us-gaap_OtherAssetsNoncurrent 142.6us-gaap_OtherAssetsNoncurrent    
Long term intercompany receivables 0holx_IntercompanyNotesReceivable 0holx_IntercompanyNotesReceivable    
Investment in subsidiaries 0holx_InvestmentInSubsidiaries 0holx_InvestmentInSubsidiaries    
Total assets 8,078.1us-gaap_Assets 8,414.7us-gaap_Assets    
Current liabilities:        
Current portion of long-term debt 139.4us-gaap_LongTermDebtCurrent 114.5us-gaap_LongTermDebtCurrent    
Accounts payable 67.0us-gaap_AccountsPayableCurrent 92.1us-gaap_AccountsPayableCurrent    
Accrued expenses 253.0us-gaap_AccruedLiabilitiesCurrent 262.1us-gaap_AccruedLiabilitiesCurrent    
Deferred revenue 148.4us-gaap_DeferredRevenueCurrent 150.9us-gaap_DeferredRevenueCurrent    
Intercompany payables 0holx_IntercompanyPayables 0holx_IntercompanyPayables    
Total current liabilities 607.8us-gaap_LiabilitiesCurrent 619.6us-gaap_LiabilitiesCurrent    
Long-term debt, net of current portion 3,815.4us-gaap_LongTermDebtNoncurrent 4,153.2us-gaap_LongTermDebtNoncurrent    
Deferred income tax liabilities 1,345.7us-gaap_DeferredTaxLiabilitiesNoncurrent 1,375.4us-gaap_DeferredTaxLiabilitiesNoncurrent    
Deferred service obligations – long-term 19.8us-gaap_DeferredRevenueNoncurrent 20.1us-gaap_DeferredRevenueNoncurrent    
Long-term intercompany payables 0holx_IntercompanyNotesPayables 0holx_IntercompanyNotesPayables    
Other long-term liabilities 187.0us-gaap_OtherLiabilitiesNoncurrent 183.4us-gaap_OtherLiabilitiesNoncurrent    
Total stockholders’ equity 2,102.4us-gaap_StockholdersEquity 2,063.0us-gaap_StockholdersEquity    
Total liabilities and stockholders’ equity 8,078.1us-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 0us-gaap_DeferredTaxAssetsNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_DeferredTaxAssetsNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Prepaid income taxes (3.1)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 (2,806.9)holx_IntercompanyReceivables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,720.2)holx_IntercompanyReceivables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets (2,810.0)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 (10.6)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 (8,706.6)holx_InvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(8,747.7)holx_InvestmentInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets (11,540.2)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 (3.1)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
   
Intercompany payables (2,807.1)holx_IntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,720.4)holx_IntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current liabilities (2,810.2)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 service obligations – long-term 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 (8,717.0)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 (11,540.2)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 150.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
288.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
105.4us-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 116.2us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
128.4us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inventories 88.0us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
88.6us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income tax assets 26.3us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
26.2us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Prepaid income taxes 0us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20.3us-gaap_PrepaidTaxes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Prepaid expenses and other current assets 18.5us-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 399.6us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
567.8us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property, plant and equipment, net 27.8us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
29.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intangible assets, net 23.6us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25.1us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Goodwill 327.8us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
282.4us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 82.7us-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 8,490.0holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,526.0holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 9,351.5us-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 139.4us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
114.5us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accounts payable 26.9us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
34.8us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued expenses 156.3us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
139.4us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred revenue 111.0us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
113.5us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany payables 2,763.9holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,676.2holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current liabilities 3,197.5us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,078.4us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term debt, net of current portion 3,815.4us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,153.2us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income tax liabilities 97.3us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
90.9us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred service obligations – long-term 8.6us-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 117.3us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
112.6us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total stockholders’ equity 2,102.4us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,063.0us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and stockholders’ equity 9,351.5us-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 249.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
287.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
237.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
387.4us-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 198.2us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
182.5us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories 174.6us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
190.1us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred income tax assets 11.7us-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 10.0us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11.0us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany receivables 2,787.9holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,702.1holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets 3,434.9us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,388.8us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property, plant and equipment, net 337.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
337.1us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intangible assets, net 3,279.0us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,377.3us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Goodwill 2,390.8us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,390.9us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other assets 57.3us-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 216.6holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
221.7holx_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets 9,716.3us-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 32.7us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
46.1us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued expenses 48.4us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
69.5us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred revenue 8.3us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
7.4us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany payables 0holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current liabilities 89.4us-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 1,244.4us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,279.1us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred service obligations – long-term 3.9us-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 33.0us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
34.3us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total stockholders’ equity 8,345.6us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
8,328.5us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities and stockholders’ equity 9,716.3us-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 144.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
160.2us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
100.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
113.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Restricted cash 5.1us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5.5us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accounts receivable, net 86.1us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
85.1us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Inventories 47.7us-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 9.2us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8.6us-gaap_PrepaidExpenseCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany receivables 19.0holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
18.1holx_IntercompanyReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current assets 312.1us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
330.5us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Property, plant and equipment, net 92.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
95.1us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intangible assets, net 40.1us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
41.9us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Goodwill 91.3us-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 550.5us-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 7.4us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11.2us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accrued expenses 51.4us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
54.3us-gaap_AccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred revenue 29.1us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
30.0us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany payables 43.2holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
44.2holx_IntercompanyPayables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current liabilities 131.1us-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 4.0us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5.4us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred service obligations – long-term 7.3us-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 36.7us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
36.5us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total stockholders’ equity 371.4us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
429.7us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total liabilities and stockholders’ equity $ 550.5us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
$ 619.5us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember