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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 1 Months Ended
Mar. 31, 2015
business
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Business Acquisition [Line Items]          
Number of businesses acquired 2us-gaap_NumberOfBusinessesAcquired        
Purchase price of acquired entity $ 64.9us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 97.1us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Goodwill from acquisition 891.1us-gaap_Goodwill   891.1us-gaap_Goodwill   856.1us-gaap_Goodwill
Direxxis [Member]          
Business Acquisition [Line Items]          
Purchase price of acquired entity     33.3us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
   
Net liabilities assumed 0.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
  0.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
   
Liability for fair value of potential additional cash payments 0.8br_BusinessAcquisitionContingentConsiderationPotentialCashPayables
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
  0.8br_BusinessAcquisitionContingentConsiderationPotentialCashPayables
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
   
Potential additional cash payments, payment period     3 years    
Goodwill from acquisition 20.1us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
  20.1us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
   
Intangible assets acquired 13.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
  13.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= br_DirexxisLLCMember
   
Direxxis [Member] | Software Technology [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible assets, remaining amortization period, years     5 years    
Direxxis [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible assets, remaining amortization period, years     10 years    
TwoFour Systems [Member]          
Business Acquisition [Line Items]          
Purchase price of acquired entity       31.6us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= br_TwoFourSystemsMember
 
Net liabilities assumed       3.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= br_TwoFourSystemsMember
 
Liability for fair value of potential additional cash payments       1.1br_BusinessAcquisitionContingentConsiderationPotentialCashPayables
/ us-gaap_BusinessAcquisitionAxis
= br_TwoFourSystemsMember
 
Potential additional cash payments, payment period       3 years  
Goodwill from acquisition       25.4us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= br_TwoFourSystemsMember
 
Intangible assets acquired       $ 10.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= br_TwoFourSystemsMember
 
TwoFour Systems [Member] | Software Technology [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible assets, remaining amortization period, years       7 years  
TwoFour Systems [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible assets, remaining amortization period, years       10 years