Presentation and Summary of Significant Accounting Policies - Intangible Assets Including Acquisition-Related Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 5,120	$ 3,399
Amortization expense	(2,388)	(1,849)
Ending balance	2,732	5,120
Halo
Finite-lived Intangible Assets [Roll Forward]
Intangibles related to the Halo Acquisition		3,570
Supply Chain Management
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	5,120	3,399
Amortization expense	(2,388)	(1,849)
Ending balance	2,732	5,120
Supply Chain Management | Halo
Finite-lived Intangible Assets [Roll Forward]
Intangibles related to the Halo Acquisition		3,570
IT Consulting
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	0	0
Amortization expense	0	0
Ending balance	0	0
IT Consulting | Halo
Finite-lived Intangible Assets [Roll Forward]
Intangibles related to the Halo Acquisition		0
Other
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	0	0
Amortization expense	0	0
Ending balance	$ 0	0
Other | Halo
Finite-lived Intangible Assets [Roll Forward]
Intangibles related to the Halo Acquisition		$ 0