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Accumulated Other Comprehensive Loss | 6 Months Ended
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Mar. 30, 2019
Accumulated Other Comprehensive Income [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss The following tables summarize the changes in accumulated balances of other comprehensive loss for the periods presented:
| Three Months Ended March 30, 2019 |  | Six Months Ended March 30, 2019
| Foreign Currency Translation |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total |  | Foreign Currency Translation |  | Pension Plans |  | Hedged Interest Rate Caps |  | Total
Beginning Balance | $ | (29.8 | ) |  | $ | (1.1 | ) |  | $ | (1.0 | ) |  | $ | (31.9 | ) |  | $ | (26.6 | ) |  | $ | (1.1 | ) |  | $ | 2.2 |  |  | $ | (25.5 | )
Other comprehensive income (loss) before reclassifications | 2.4 |  |  | — |  |  | (1.5 | ) |  | 0.9 |  |  | (0.8 | ) |  | — |  |  | (5.4 | ) |  | (6.2 | )
Amounts reclassified to statement of income | — |  |  | — |  |  | 0.5 |  |  | 0.5 |  |  | — |  |  | — |  |  | 1.2 |  |  | 1.2 |
Ending Balance | $ | (27.4 | ) |  | $ | (1.1 | ) |  | $ | (2.0 | ) |  | $ | (30.5 | ) |  | $ | (27.4 | ) |  | $ | (1.1 | ) |  | $ | (2.0 | ) |  | $ | (30.5 | )
| 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 | )

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- Definition Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration