Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Property, Plant and Equipment [Line Items]
Total cost	$ 480,436	$ 348,868
Less accumulated depreciation	(136,169)	(114,823)
Net property, plant and equipment	344,267	234,045
Land
Property, Plant and Equipment [Line Items]
Total cost	46,422	27,447
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Total cost	300,902	214,462
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 133,112	$ 106,959