Revenues by Geographic Regions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013		Apr. 30, 2012		Apr. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 160,296		$ 106,136		$ 64,482
Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	122,058	[1]	82,851	[1]	51,259	[1]
EMEA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	28,600	[2]	19,239	[2]	12,147	[2]
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 9,638		$ 4,046		$ 1,076

[1] United States and Canada

[2] Europe, the Middle East and Africa ("EMEA")