Restructuring Charges - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 16, 2015	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	May. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring Charge		$ 1,839	$ (107)	$ 8,269	$ (317)
Fiscal Year 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 9,900
Restructuring charges incurred to date		$ 8,300		$ 8,300		$ 8,300
Fiscal Year 2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge						$ 2,900
Fiscal Year 2013 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date							$ 4,100