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Acquisitions - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Aug. 31, 2016
USD ($)
Milestone
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]            
Cash payment on acquisition         $ 216.1  
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          
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) $ (0.1)    
Change in non-controlling interest     0.2 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 $ 1.8    
Acquired intangible assets     $ 295.6      
Estimated net cash flows, discount rate       16.00%    
Acquisition costs           $ 5.0
Revenue contributed by acquired entity   $ 30.4   $ 91.0    
Operating expenses related to acquired entity   29.7   88.6    
Assurex [Member] | Developed Technology [Member]            
Business Acquisition [Line Items]            
Acquired intangible assets   256.5   $ 256.5    
Intangible assets estimated useful lives       17 years    
Assurex [Member] | Database [Member]            
Business Acquisition [Line Items]            
Acquired intangible assets   $ 39.1   $ 39.1    
Intangible assets estimated useful lives       5 years