Presentation and Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 25,888	$ 25,888
Goodwill, ending balance	25,888	25,888
Goodwill	25,888	25,888
Supply Chain Management
Goodwill [Roll Forward]
Goodwill, beginning balance	25,888	25,888
Goodwill, ending balance	25,888	25,888
Goodwill	25,888	25,888
IT Consulting
Goodwill [Roll Forward]
Goodwill, beginning balance	0	0
Goodwill, ending balance	0	0
Goodwill	0	0
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	0	0
Goodwill, ending balance	0	0
Goodwill	$ 0	$ 0