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Acquisitions - Additional Information (Detail)
$ in Millions
 3 Months Ended
Aug. 31, 2016
USD ($)
Milestone
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]        
Cash payment on acquisition     $ 213.0  
Change in non-controlling interest   $ 1.9    
Assurex [Member]        
Business Acquisition [Line Items]        
Date of acquisition agreement Aug. 31, 2016      
Total consideration transferred $ 351.6 351.6    
Business acquisition, net cash acquired 5.5 5.5    
Cash payment on acquisition $ 216.1      
Number of potential performance-based milestones | Milestone 2      
Additional payments upon completion of performance based milestones $ 185.0      
Contingent consideration 130.0 $ 130.0    
Contingent consideration, valuation method   The fair value of the performance-based milestones was determined by using the Monte Carlo Method.    
Amount of cash consideration deposited in escrow account $ 19.1      
Fair value increase to equipment   $ (0.1)    
Change in non-controlling interest   0.2    
Net increase to goodwill due to change in non-controlling interest   0.1    
Increase in deferred tax liability due to differences in GAAP and tax purchase accounting   1.8    
Acquired intangible assets   $ 295.6    
Estimated net cash flows, discount rate   16.00%    
Acquisition costs       $ 5.0
Revenue contributed by acquired entity   $ 28.8    
Operating expenses related to acquired entity   25.8    
Assurex [Member] | Developed Technology [Member]        
Business Acquisition [Line Items]        
Acquired intangible assets   $ 256.5    
Intangible assets estimated useful lives   17 years    
Assurex [Member] | Database [Member]        
Business Acquisition [Line Items]        
Acquired intangible assets   $ 39.1    
Intangible assets estimated useful lives   5 years