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Stock-Based Compensation Narrative (Detail) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     1,443,959us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 1,409,557us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Total compensation expense on awards     $ 7,108,000us-gaap_ShareBasedCompensation $ 6,516,000us-gaap_ShareBasedCompensation
Stock Issued During Period, Shares, Employee Stock Purchase Plans 96,415us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 115,132us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 96,415us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 115,132us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options 900,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,000,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 900,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,000,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Board of Director Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     62,405us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= brks_BoardofDirectorUnitsMember
77,557us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= brks_BoardofDirectorUnitsMember
Restricted Stock, Performance Based Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of Performance-Based Units Awarded, Maximum     200.00%brks_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPercentageofPerformanceBasedUnitsAwardedMaximum
/ us-gaap_AwardTypeAxis
= brks_RestrictedStockPerformanceBasedSharesMember
 
Restricted stocks granted     824,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= brks_RestrictedStockPerformanceBasedSharesMember
808,125us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= brks_RestrictedStockPerformanceBasedSharesMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Potentially Vested Shares       1,250,169brks_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPotentiallyVestedShares
/ us-gaap_AwardTypeAxis
= brks_RestrictedStockPerformanceBasedSharesMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Potentially Vested Shares, Amount Greater than Target       442,044brks_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPotentiallyVestedSharesAmountGreaterthanTarget
/ us-gaap_AwardTypeAxis
= brks_RestrictedStockPerformanceBasedSharesMember
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     1,443,959us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Fair value of restricted stock awards vested 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
7,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
4,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unrecognized compensation cost $ 21,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  $ 21,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized compensation cost, estimated weighted average amortization period     1 year 11 months