Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Disaggregation of Revenue [Line Items]
Total oncology revenue	$ 15,035	$ 13,489	$ 29,030	$ 27,550
Pharmacology services
Disaggregation of Revenue [Line Items]
Total oncology revenue	14,515	12,498	27,745	25,567
TOS data license revenue
Disaggregation of Revenue [Line Items]
Total oncology revenue	157	0	468	0
Other TOS revenue
Disaggregation of Revenue [Line Items]
Total oncology revenue	$ 363	$ 991	$ 817	$ 1,983