Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Revenues:
Revenues	$ 31,011	$ 32,422	$ 93,745	$ 92,904
Domestic
Revenues:
Revenues	24,662	27,334	75,891	77,958
International
Revenues:
Revenues	$ 6,349	$ 5,088	$ 17,854	$ 14,946