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Acquisitions - Additional Information (Detail)
€ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Aug. 31, 2016
USD ($)
Milestone
May 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
May 31, 2016
EUR (€)
Business Acquisition [Line Items]                
Cash payment on acquisition         $ 216.1      
Goodwill     $ 315.0 $ 315.0 315.0   $ 195.3  
Increase in goodwill due to working capital adjustment         0.8      
Decrease in contingent consideration     (5.2)   (2.0)      
Assurex [Member]                
Business Acquisition [Line Items]                
Total consideration transferred $ 351.6   351.6 351.6 351.6      
Business acquisition, net cash acquired 5.5   5.5 5.5 5.5      
Cash payment on acquisition $ 216.1       216.1      
Number of potential performance-based milestones | Milestone 2              
Additional payments upon completion of performance based milestones $ 185.0              
Contingent consideration 130.0   130.0 130.0 $ 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              
Goodwill $ 119.7   119.7 119.7 $ 119.7 $ 116.3    
Amount transfers into goodwill       1.7 1.7      
Increase in goodwill due to working capital adjustment       3.1 3.1      
Decrease in deferred tax liability due to a change in blended state tax rate and changes in the pre-acquisition deferred tax liabilities     (0.8)   (1.4)      
Decrease in goodwill due to a change in blended state tax rate and changes in the pre-acquisition deferred tax liabilities     (0.8) (1.4) (1.4)      
Acquired intangible assets     295.6 295.6 $ 295.6      
Estimated net cash flows, discount rate         16.00%      
Acquisition costs     5.0 5.0 $ 5.0      
Revenue contributed by acquired entity     23.9   53.0      
Operating expenses related to acquired entity     27.8   69.0      
Assurex [Member] | Developed Technology [Member]                
Business Acquisition [Line Items]                
Acquired intangible assets     256.5 256.5 $ 256.5      
Intangible assets estimated useful lives         17 years      
Assurex [Member] | Database [Member]                
Business Acquisition [Line Items]                
Acquired intangible assets     39.1 39.1 $ 39.1      
Intangible assets estimated useful lives         5 years      
Sividon Diagnostics GmbH [Member]                
Business Acquisition [Line Items]                
Total consideration transferred   $ 51.9            
Business acquisition, net cash acquired   2.0            
Cash payment on acquisition   39.0            
Contingent consideration   10.9            
Goodwill   18.5            
Acquired intangible assets   $ 45.8            
Business combination upfront and potential in additional performance based milestones     $ 16.1 $ 16.1 $ 16.1     € 15.0
Decrease in contingent consideration         0.4      
Decrease in intangibles         0.4      
Increase in goodwill         $ 0.8