Net Restructuring and Related Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 7,167	$ 9,641	$ (354)
Fiscal Year 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 7,200
Fiscal Year 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge		$ 9,600
Fiscal Year 2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge			(300)
Fiscal Year 2013 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge			$ (100)