Annual report pursuant to Section 13 and 15(d)

Goodwill And Intangible Assets - Additional Information (Detail)

v3.20.2
Goodwill And Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Schedule Of Goodwill And Intangible Assets [Line Items]      
Amortization expense $ 16.3 $ 13.5 $ 14.7
Amortizable intangible assets fully amortization year 2032    
General and Administrative Expenses      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Impairment of intangible assets   106.6  
Pivot Leadership      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Tax deductible goodwill $ 7.2 $ 7.1  
Acquired Companies      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Tax deductible goodwill 34.9    
Acquired Companies | IP      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Intangibles assets $ 36.0    
Weighted average useful life 7 years    
Acquired Companies | Customer Relationships      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Intangibles assets $ 6.2    
Weighted average useful life 10 years    
Acquired Companies | Trade Names      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Intangibles assets $ 3.2    
Weighted average useful life 9 years