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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income | The following tables summarize the changes in accumulated balances of other comprehensive loss for the periods presented:
| Three Months Ended March 31, 2018 |  | Six Months Ended March 31, 2018
| Foreign Currency Translation |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total |  | Foreign Currency Translation |  | Marketable Securities |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total
Beginning Balance | $ | (13.0 | ) |  | $ | (1.0 | ) |  | $ | 2.3 |  |  | $ | (11.7 | ) |  | $ | (18.5 | ) |  | $ | (0.4 | ) |  | $ | (1.6 | ) |  | $ | 4.3 |  |  | $ | (16.2 | )
Other comprehensive income (loss) before reclassifications | 10.1 |  |  | — |  |  | 0.7 |  |  | 10.8 |  |  | 15.6 |  |  | — |  |  | 0.6 |  |  | (3.6 | ) |  | 12.6 |
Amounts reclassified to statement of income | — |  |  | — |  |  | 0.3 |  |  | 0.3 |  |  | — |  |  | 0.4 |  |  | — |  |  | 2.6 |  |  | 3.0 |
Ending Balance | $ | (2.9 | ) |  | $ | (1.0 | ) |  | $ | 3.3 |  |  | $ | (0.6 | ) |  | $ | (2.9 | ) |  | $ | — |  |  | $ | (1.0 | ) |  | $ | 3.3 |  |  | $ | (0.6 | )
| Three Months Ended April 1, 2017 |  | Six Months Ended April 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 | $ | (41.8 | ) |  | $ | 2.1 |  |  | $ | (2.5 | ) |  | $ | (0.6 | ) |  | $ | (42.8 | ) |  | $ | (26.1 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | (3.4 | ) |  | $ | (32.3 | )
Other comprehensive income (loss) before reclassifications | 3.4 |  |  | 0.1 |  |  | — |  |  | 0.4 |  |  | 3.9 |  |  | (12.3 | ) |  | 2.4 |  |  | — |  |  | 1.1 |  |  | (8.8 | )
Amounts reclassified to statement of income | — |  |  | (2.5 | ) |  | — |  |  | 1.2 |  |  | (1.3 | ) |  | — |  |  | (2.4 | ) |  | — |  |  | 3.3 |  |  | 0.9 |
Ending Balance | $ | (38.4 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | 1.0 |  |  | $ | (40.2 | ) |  | $ | (38.4 | ) |  | $ | (0.3 | ) |  | $ | (2.5 | ) |  | $ | 1.0 |  |  | $ | (40.2 | )

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- Definition Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
Name: | holx_AccumulatedOtherComprehensiveIncomeAbstract
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=84228862&loc=SL7669686-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
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