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Business Segments and Geographic Information - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 28, 2015 Segment Customer | Mar. 29, 2014 Customer | Mar. 28, 2015 Segment Customer | Mar. 29, 2014 Customer | Sep. 27, 2014 Customer
Segment Reporting Disclosure [Line Items] |  |  |  |  |
Number of reportable segments | 4us-gaap_NumberOfOperatingSegments |  | 4us-gaap_NumberOfOperatingSegments |  |
Revenues | $ 655,500,000us-gaap_Revenues | $ 625,000,000us-gaap_Revenues | $ 1,308,300,000us-gaap_Revenues | $ 1,237,400,000us-gaap_Revenues |
Customers with balances greater than 10% of accounts receivable | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfAccountsReceivable |  | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfAccountsReceivable |  | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfAccountsReceivable
Customer represented greater than 10% of consolidated revenues | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue | 0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue |
Countries with greater than 10% of consolidated revenue | 0holx_Numberofcountrieswithgreaterthan10ofconsolidatedrevenue |  | 0holx_Numberofcountrieswithgreaterthan10ofconsolidatedrevenue |  |
Number of reportable segments |  |  | 4us-gaap_NumberOfReportableSegments |  |
Intersegment |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |
Revenues | $ 0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | $ 0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | $ 0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | $ 0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |

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- Definition Number of countries with greater than 10% of consolidated revenue + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of customers accounting for more than ten percent of accounts receivable. + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of customers accounting for more than ten percent of revenue. + References No definition available. + Details
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- Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Details
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