Quarterly report pursuant to Section 13 or 15(d)

Fee Revenue - Additional Information (Details 1)

v3.21.2
Fee Revenue - Additional Information (Details 1)
$ in Millions
 3 Months Ended
Jul. 31, 2021
USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue recognized, remaining performance obligation $ 804.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-08-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue recognized, remaining performance obligation $ 367.6
Revenue, remaining performance obligation, expected timing of satisfaction, period 9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-05-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue recognized, remaining performance obligation $ 249.8
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-05-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue recognized, remaining performance obligation $ 123.7
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-05-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue recognized, remaining performance obligation $ 63.1
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, expected timing of satisfaction, explanation 2025 and thereafter