Basis of Presentation, Business and Summary of Significant Accounting Policies - Revision of Condensed Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Apr. 30, 2016
Effect of the revision
Provision for (benefit from) income taxes	$ 6,159	$ 2,855
Net income	$ 9,163	$ 3,011	$ 12,564
Net income per share:
Basic (in dollars per share)	$ 0.24	$ 0.09
Diluted (in dollars per share)	$ 0.24	$ 0.09
As previously reported
Effect of the revision
Provision for (benefit from) income taxes		$ 3,080
Net income		$ 2,786
Net income per share:
Basic (in dollars per share)		$ 0.09
Diluted (in dollars per share)		$ 0.08
Adjustment | Correction to statutory tax rate used in purchase accounting for April 1, 2014 Acquisition
Effect of the revision
Provision for (benefit from) income taxes		$ (225)
Net income		$ 225
Net income per share:
Diluted (in dollars per share)		$ 0.01