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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
	Dec. 27, 2014	Dec. 28, 2013
Earnings Per Share [Line Items]
Basic weighted average common shares outstanding (in shares)	278,671us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	272,708us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common stock equivalents from assumed exercise of stock options and restricted stock units (in shares)	2,464us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Incremental shares from assumed conversion of the Convertible Notes premium (in shares)	2,041holx_IncrementalCommonSharesAttributableToTheConversionOfDebtSecurities	0holx_IncrementalCommonSharesAttributableToTheConversionOfDebtSecurities
Diluted weighted average common shares outstanding (in shares)	283,176us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	272,708us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Outstanding Stock Options
Weighted-average anti-dilutive shares related to:
Weighted-average anti-dilutive shares (in shares)	3,782us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember	7,199us-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)	140us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember	950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember

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