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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Jul. 01, 2017
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income |
| Three Months Ended July 1, 2017 |  | Nine Months Ended July 1, 2017
| Foreign Currency Translation |  | Marketable Securities |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total |  | Foreign Currency Translation |  | Marketable Securities |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total
Beginning Balance | $ | (38.4 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | 1.0 |  |  | $ | (40.2 | ) |  | $ | (26.1 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | (3.4 | ) |  | $ | (32.3 | )
Other comprehensive income (loss) before reclassifications | 11.6 |  |  | — |  |  | — |  |  | (0.4 | ) |  | 11.2 |  |  | (0.7 | ) |  | 2.4 |  |  | — |  |  | 0.7 |  |  | 2.4 |
Amounts reclassified to statement of income | — |  |  | — |  |  | — |  |  | 1.6 |  |  | 1.6 |  |  | — |  |  | (2.4 | ) |  | — |  |  | 4.9 |  |  | 2.5 |
Ending Balance | $ | (26.8 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | 2.2 |  |  | $ | (27.4 | ) |  | $ | (26.8 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | 2.2 |  |  | $ | (27.4 | )
| Three Months Ended June 25, 2016 |  | Nine Months Ended June 25, 2016
| Foreign Currency Translation |  | Marketable Securities |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total |  | Foreign Currency Translation |  | Marketable Securities |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total
Beginning Balance | $ | (21.1 | ) |  | $ | (1.5 | ) |  | $ | (1.8 | ) |  | $ | (4.8 | ) |  | $ | (29.2 | ) |  | $ | (15.7 | ) |  | $ | 6.9 |  |  | $ | (1.8 | ) |  | $ | (3.9 | ) |  | $ | (14.5 | )
Other comprehensive income (loss) before reclassifications | (3.8 | ) |  | — |  |  | — |  |  | (1.5 | ) |  | (5.3 | ) |  | (9.2 | ) |  | (1.2 | ) |  | — |  |  | (3.4 | ) |  | (13.8 | )
Amounts reclassified to statement of income | — |  |  | — |  |  | — |  |  | 1.2 |  |  | 1.2 |  |  | — |  |  | (7.2 | ) |  | — |  |  | 2.2 |  |  | (5.0 | )
Ending Balance | $ | (24.9 | ) |  | $ | (1.5 | ) |  | $ | (1.8 | ) |  | $ | (5.1 | ) |  | $ | (33.3 | ) |  | $ | (24.9 | ) |  | $ | (1.5 | ) |  | $ | (1.8 | ) |  | $ | (5.1 | ) |  | $ | (33.3 | )

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- Definition Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
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Namespace Prefix: | holx_
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration