Restructuring Charges, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 33,013	$ 9,468	$ 3,682
Restructuring liability included in other long-term liabilities	600	300
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	32,151	9,224	800
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 862	$ 244	$ 2,900