Presentation and Summary of Significant Accounting Policies - Acquisition-Related Intangible Assets (Details) - Acquired Finite Lived Intangible Assets - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition-related intangible assets	$ 8,140	$ 8,140
Accumulated amortization	(7,993)	(7,780)
Total amortization expense	$ 147	360
Current Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization in Years	3 years
Acquisition-related intangible assets	$ 6,000	6,000
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization in Years	8 years
Acquisition-related intangible assets	$ 1,700	1,700
Non-compete
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization in Years	3 years
Acquisition-related intangible assets	$ 100	100
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization in Years	3 years
Acquisition-related intangible assets	$ 340	$ 340