Acquired Intangible Assets, net for Continuing Operations (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Apr. 30, 2017
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Gross Fair Value	$ 15,100	$ 15,100
Accumulated Amortization	(7,855)	(7,383)
Total	7,245	7,717
Customer relationships
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, gross	11,835	11,835
Accumulated Amortization	(5,704)	(5,395)
Acquired finite-lived intangible assets, net book value	6,131	6,440
Developed technology
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, gross	3,265	3,265
Accumulated Amortization	(2,151)	(1,988)
Acquired finite-lived intangible assets, net book value	$ 1,114	$ 1,277