Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016
Property, Plant and Equipment [Line Items]
Total cost	$ 590,675	$ 480,436
Less accumulated depreciation	(165,437)	(136,169)
Net property, plant and equipment	425,238	344,267
Land
Property, Plant and Equipment [Line Items]
Total cost	48,812	46,422
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Total cost	380,139	300,902
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 161,724	$ 133,112