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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Income Tax Disclosure [Line Items]        
Provision for income taxes   $ 9.2 $ 10.3  
Provision for income taxes excluding impact for contingent consideration     $ 11.3  
Gross unrecognized tax benefits   11.9   $ 11.6
Gross unrecognized tax benefits increased during the year   0.3    
Interest and penalties accrued related to unrecognized tax benefits   1.2    
Increase in interest and penalties accrued related to unrecognized tax benefits   0.1    
Maximum [Member]        
Income Tax Disclosure [Line Items]        
Change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit   $ 2.0    
National Tax Agency Japan        
Income Tax Disclosure [Line Items]        
Open tax year   2015    
Japan [Member]        
Income Tax Disclosure [Line Items]        
Expected reduction of corporate income tax 3.29%      
Effective tax rate 35.60%      
Expected national and local effective tax rate percentage 32.30%