Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016
Property, Plant and Equipment [Line Items]
Total cost	$ 502,288	$ 480,436
Less accumulated depreciation	(142,049)	(136,169)
Property, plant and equipment, net	360,239	344,267
Land
Property, Plant and Equipment [Line Items]
Total cost	46,171	46,422
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Total cost	315,947	300,902
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 140,170	$ 133,112