Summary of Significant Accounting Policies - Additional Information (Detail) - Customer	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Apr. 30, 2016
Accounting Policies [Abstract]
Number of clients that accounted for more than 10% of account receivables	0		0
Number of clients that accounted for more than 10% of revenue	0	0
Minimum [Member] | Software as a Service (“SaaS”)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Service agreement period	1 year
Maximum [Member] | Software as a Service (“SaaS”)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Service agreement period	3 years