Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017
Property, Plant and Equipment [Line Items]
Total cost	$ 723,531	$ 590,675
Less accumulated depreciation	(201,477)	(165,437)
Net property, plant and equipment	522,054	425,238
Land
Property, Plant and Equipment [Line Items]
Total cost	57,413	48,812
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Total cost	468,824	380,139
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 197,294	$ 161,724