Operating Segment and Geographic Information - Revenue from Continuing Operations by Geographic Region (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from continued operations		$ 48,317	$ 49,562	$ 47,325	$ 45,977	$ 43,078	$ 43,600	$ 41,148	$ 40,319	$ 191,181	$ 168,145	$ 146,812
Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from continued operations	[1]									146,086	127,766	109,545
EMEA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from continued operations	[2]									38,101	33,499	27,952
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from continued operations										$ 6,994	$ 6,880	$ 9,315

[1] United States, Canada and Brazil

[2] Europe, the Middle East and Africa