Presentation and Summary of Significant Accounting Policies - Intangible Assets Including Acquisition-Related Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	$ 3,399	$ 1,858
Amortization expense	(1,849)	(1,659)
Ending Balance	5,120	3,399
AdapChain Inc
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition		3,200
Halo
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition	3,570
Supply Chain Management
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	3,399	1,858
Amortization expense	(1,849)	(1,659)
Ending Balance	5,120	3,399
Supply Chain Management | AdapChain Inc
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition		$ 3,200
Supply Chain Management | Halo
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition	$ 3,570