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Stock-Based Compensation Narrative (Detail) (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stocks granted 1,375,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 1,332,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Total compensation expense on awards $ 3,483,000us-gaap_ShareBasedCompensation $ 2,754,000us-gaap_ShareBasedCompensation
Closing stock price $ 12.75brks_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsClosingStockPrice  
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 1,375,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Fair value of restricted stock awards vested 6,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
3,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Unrecognized compensation cost $ 27,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized compensation cost, estimated weighted average amortization period 2 years 1 month