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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Apr. 24, 2020
Apr. 30, 2020
Sep. 30, 2021
May 28, 2021
Pre C A R D I A Inc        
Restructuring Cost And Reserve [Line Items]        
Business acquisition interests acquired percentage       100.00%
Payments to acquire businesses     $ 115.2  
Potential payouts payments     5.0  
Cash given to repurchase of shares from shareholders     82.8  
Business acquisition, transaction costs     32.4  
Gain on previously owned minority interest     21.0  
Net asset acquired     115.2  
Fair value of asset in process with research and development     115.5  
Net liabilities assumed     0.3  
Research and development expense     $ 115.5  
Breethe        
Restructuring Cost And Reserve [Line Items]        
Payments to acquire businesses $ 55.0 $ 55.0    
Breethe | Maximum        
Restructuring Cost And Reserve [Line Items]        
Potential payouts payments $ 55.0 $ 55.0