Presentation and Summary of Significant Accounting Policies - Intangible Assets Including Acquisition-Related Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 360	$ 1,132
Amortization expense	(213)	(772)
Ending balance	147	360
Supply Chain Management
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	360	1,132
Amortization expense	(213)	(772)
Ending balance	147	360
IT Consulting
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	0	0
Amortization expense	0	0
Ending balance	0	0
Other
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	0	0
Amortization expense	0	0
Ending balance	$ 0	$ 0