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Restructuring - Additional Information (Detail)
$ in Thousands
12 Months Ended
Jul. 31, 2017
USD ($)
Employee
Jul. 31, 2016
USD ($)
Employee
Jul. 31, 2015
USD ($)
Employee
Restructuring Cost and Reserve [Line Items]      
Restructuring, net $ 1,967 $ 7,421 $ 5,130
Restructuring charge related to workforce reduction 1,500 5,900 4,900
Restructuring charge related to facility closed $ 500 $ 1,500 $ 200
Number of workforce reduction | Employee 78 228 235