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Accumuated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Mar. 26, 2016
Accumulated Other Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following tables summarize the changes in accumulated balances of other comprehensive loss for the periods presented:
| Three Months Ended March 26, 2016 |  | Six Months Ended March 26, 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 | $ | (19.9 | ) |  | $ | (0.9 | ) |  | $ | (1.8 | ) |  | $ | (3.3 | ) |  | $ | (25.9 | ) |  | $ | (15.7 | ) |  | $ | 6.9 |  |  | $ | (1.8 | ) |  | $ | (3.9 | ) |  | $ | (14.5 | )
Other comprehensive income (loss) before reclassifications | (1.2 | ) |  | (0.6 | ) |  | — |  |  | (2.2 | ) |  | (4.0 | ) |  | (5.4 | ) |  | (1.2 | ) |  | — |  |  | (1.9 | ) |  | (8.5 | )
Amounts reclassified to statement of income | — |  |  | — |  |  | — |  |  | 0.7 |  |  | 0.7 |  |  | — |  |  | (7.2 | ) |  | — |  |  | 1.0 |  |  | (6.2 | )
Ending Balance | $ | (21.1 | ) |  | $ | (1.5 | ) |  | $ | (1.8 | ) |  | $ | (4.8 | ) |  | $ | (29.2 | ) |  | $ | (21.1 | ) |  | $ | (1.5 | ) |  | $ | (1.8 | ) |  | $ | (4.8 | ) |  | $ | (29.2 | )
| Three Months Ended March 28, 2015 |  | Six Months Ended March 28, 2015
| 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 | $ | (13.7 | ) |  | $ | 14.0 |  |  | $ | (1.5 | ) |  | $ | — |  |  | $ | (1.2 | ) |  | $ | (4.7 | ) |  | $ | 8.9 |  |  | $ | (1.6 | ) |  | $ | — |  |  | $ | 2.6 |
Other comprehensive income (loss) before reclassifications | (9.5 | ) |  | (8.3 | ) |  | — |  |  | (1.6 | ) |  | (19.4 | ) |  | (18.5 | ) |  | (3.2 | ) |  | 0.1 |  |  | (1.6 | ) |  | (23.2 | )
Amounts reclassified to statement of income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Ending Balance | $ | (23.2 | ) |  | $ | 5.7 |  |  | $ | (1.5 | ) |  | $ | (1.6 | ) |  | $ | (20.6 | ) |  | $ | (23.2 | ) |  | $ | 5.7 |  |  | $ | (1.5 | ) |  | $ | (1.6 | ) |  | $ | (20.6 | )

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- Definition Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
Name: | holx_AccumulatedOtherComprehensiveIncomeAbstract
Namespace Prefix: | holx_
Data Type: | xbrli:stringItemType
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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=36458714&loc=SL7669686-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration