Goodwill And Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Schedule Of Goodwill And Intangible Assets [Line Items]
Amortization expense	$ 23.7	$ 20.3	$ 19.2
Salo
Schedule Of Goodwill And Intangible Assets [Line Items]
Tax deductible goodwill	114.3
Intangible assets	32.0
Infinity Consulting Solutions
Schedule Of Goodwill And Intangible Assets [Line Items]
Tax deductible goodwill	64.9
Intangible assets	16.4
Miller Heimain
Schedule Of Goodwill And Intangible Assets [Line Items]
Tax deductible goodwill	16.3	22.7
Pivot Leadership
Schedule Of Goodwill And Intangible Assets [Line Items]
Tax deductible goodwill	5.2	5.9
Current Year Acquisition | Customer Relationships
Schedule Of Goodwill And Intangible Assets [Line Items]
Intangible assets	$ 45.3	$ 15.5
Weighted average useful life	7 years	7 years
Current Year Acquisition | Trade Names
Schedule Of Goodwill And Intangible Assets [Line Items]
Intangible assets	$ 3.1	$ 1.8
Weighted average useful life	2 years	2 years