Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Intangible Assets [Line Items]
Gross	$ 284,493	$ 278,451
Accumulated Amortization	(214,472)	(189,496)
Net	70,021	88,955
Exchange rate fluctuations	172	(122)
Amortized intangible assets, net	70,193	88,833
Intangible asset addition	6,000	0
Customer lists
Intangible Assets [Line Items]
Gross	197,370	192,099
Accumulated Amortization	(139,957)	(121,977)
Net	57,413	70,122
Intellectual property
Intangible Assets [Line Items]
Gross	69,100	69,100
Accumulated Amortization	(58,421)	(52,804)
Net	10,679	16,296
Trademarks
Intangible Assets [Line Items]
Gross	12,857	12,086
Accumulated Amortization	(10,928)	(9,549)
Net	1,929	2,537
Proprietary databases
Intangible Assets [Line Items]
Gross	4,256	4,256
Accumulated Amortization	(4,256)	(4,256)
Net	0	0
Non-compete agreements
Intangible Assets [Line Items]
Gross	910	910
Accumulated Amortization	(910)	(910)
Net	$ 0	$ 0