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Business Segments and Geographic Information - Segment Information (Detail) (USD $)	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Sep. 27, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 652,800,000us-gaap_Revenues	$ 612,500,000us-gaap_Revenues
Operating income (loss)	103,500,000us-gaap_OperatingIncomeLoss	61,300,000us-gaap_OperatingIncomeLoss
Depreciation and amortization	122,000,000us-gaap_DepreciationAmortizationAndAccretionNet	127,800,000us-gaap_DepreciationAmortizationAndAccretionNet
Capital expenditures	21,100,000us-gaap_PaymentsToAcquireProductiveAssets	16,400,000us-gaap_PaymentsToAcquireProductiveAssets
Identifiable assets	8,078,100,000us-gaap_Assets		8,414,700,000us-gaap_Assets
Diagnostics
Segment Reporting Information [Line Items]
Total revenues	304,100,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember	285,700,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember
Operating income (loss)	28,200,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember	4,800,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember
Depreciation and amortization	88,600,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember	92,200,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember
Capital expenditures	14,800,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember	10,300,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember
Identifiable assets	4,294,500,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember		4,383,500,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_DiagnosticsMember
Breast Health
Segment Reporting Information [Line Items]
Total revenues	242,000,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember	226,500,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember
Operating income (loss)	60,600,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember	43,800,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember
Depreciation and amortization	7,600,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember	9,400,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember
Capital expenditures	2,600,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember	1,800,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember
Identifiable assets	847,300,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember		859,800,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_BreastHealthMember
GYN Surgical
Segment Reporting Information [Line Items]
Total revenues	84,400,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember	78,900,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember
Operating income (loss)	13,100,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember	11,100,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember
Depreciation and amortization	25,600,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember	26,000,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember
Capital expenditures	2,000,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember	1,800,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember
Identifiable assets	1,726,800,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember		1,748,200,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_GynSurgicalMember
Skeletal Health
Segment Reporting Information [Line Items]
Total revenues	22,300,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember	21,400,000us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember
Operating income (loss)	1,600,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember	1,600,000us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember
Depreciation and amortization	200,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember	200,000us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember
Capital expenditures	200,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember	100,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember
Identifiable assets	25,100,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember		26,100,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = holx_SkeletalHealthMember
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	1,500,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	2,400,000us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Identifiable assets	$ 1,184,400,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember		$ 1,397,100,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X

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