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Acquisitions - Summary Of Briefly Describe the Company's Acquisition Activity (Parenthetical) (Detail)

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Acquisitions - Summary Of Briefly Describe the Company's Acquisition Activity (Parenthetical) (Detail)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 18, 2020
USD ($)
Dec. 01, 2020
USD ($)
Sep. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Oct. 31, 2019
USD ($)
Oct. 31, 2019
EUR (€)
Jul. 19, 2019
USD ($)
Jul. 19, 2019
EUR (€)
Jul. 09, 2019
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2018
EUR (€)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]                              
Purchase consideration, net of cash acquired                         $ 290.1 $ 55.7 $ 9.1
SunNuclear                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition Dec. 18, 2020                            
Business acquisition, Percentage of voting interests acquired 100.00%                            
Purchase consideration, net of cash acquired $ 258.1                            
Dosimetrics                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition   Dec. 01, 2020                          
Business acquisition, Percentage of voting interests acquired   100.00%                          
Purchase consideration, net of cash acquired   $ 3.0                          
Biodex                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition     Sep. 01, 2020                        
Business acquisition, Percentage of voting interests acquired     100.00%                        
Purchase consideration, net of cash acquired     $ 26.9                        
AWST                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition       Mar. 31, 2020 Mar. 31, 2020                    
Business acquisition, Percentage of voting interests acquired       100.00% 100.00%                    
Purchase consideration, net of cash acquired       $ 26.9 € 24.5                    
Selmic                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition           Oct. 31, 2019 Oct. 31, 2019                
Business acquisition, Percentage of voting interests acquired           100.00% 100.00%                
Purchase consideration, net of cash acquired           $ 10.2 € 9.1                
Premium Analyse                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition               Jul. 19, 2019 Jul. 19, 2019            
Business acquisition, Percentage of voting interests acquired               100.00% 100.00%            
Purchase consideration, net of cash acquired               $ 8.9 € 7.9            
Capintec                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition                   Jul. 09, 2019          
Business acquisition, Percentage of voting interests acquired                   100.00%          
Purchase consideration, net of cash acquired                   $ 14.5          
NRG Dosimetry Services Group                              
Business Acquisition [Line Items]                              
Business acquisition, Effective date of acquisition                     Oct. 31, 2018 Oct. 31, 2018      
Business acquisition, Percentage of voting interests acquired                     100.00% 100.00%      
Purchase consideration, net of cash acquired                     $ 9.1 € 7.8