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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 11.2us-gaap_AllocatedShareBasedCompensationExpense $ 9.9us-gaap_AllocatedShareBasedCompensationExpense $ 19.6us-gaap_AllocatedShareBasedCompensationExpense $ 14.7us-gaap_AllocatedShareBasedCompensationExpense
Related tax benefits 4.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 3.7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 7.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 5.5us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Unrecognized compensation cost related to non-vested stock options 10.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   10.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Unrecognized compensation cost of restricted stock awards     $ 44.0br_UnrecognizedCompensationCostOfRestrictedStockAwards  
Amortization period of unrecognized compensation cost for non-vested stock options     2 years 10 months 12 days  
Amortization period of unrecognized compensation cost for restricted stock awards     1 year 8 months 12 days