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Net Income (Loss) Per Share - Reconciliation of Basic and Diluted Share Amounts (Detail) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014
Earnings Per Share [Line Items] |  |  |  |
Basic weighted average common shares outstanding (in shares) | 280,338us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 274,589us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 279,505us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 273,648us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common stock equivalents from assumed exercise of stock options and restricted stock units (in shares) | 2,492us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,478us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Incremental shares from assumed conversion of the Convertible Notes premium (in shares) | 4,750holx_IncrementalCommonSharesAttributableToTheConversionOfDebtSecurities | 0holx_IncrementalCommonSharesAttributableToTheConversionOfDebtSecurities | 3,395holx_IncrementalCommonSharesAttributableToTheConversionOfDebtSecurities | 0holx_IncrementalCommonSharesAttributableToTheConversionOfDebtSecurities
Diluted weighted average common shares outstanding (in shares) | 287,580us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 274,589us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 285,378us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 273,648us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Outstanding Stock Options |  |  |  |
Weighted-average anti-dilutive shares related to: |  |  |  |
Weighted-average anti-dilutive shares (in shares) | 1,865us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember | 7,950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember | 2,824us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember | 7,575us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember
Restricted stock units |  |  |  |
Weighted-average anti-dilutive shares related to: |  |  |  |
Weighted-average anti-dilutive shares (in shares) | 46us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember | 517us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember | 93us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember | 733us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember

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