Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Property, Plant and Equipment [Line Items]
Property plant and equipment	$ 750,029	$ 612,546
Accumulated depreciation	(322,008)	(282,556)
Property, plant and equipment, net	428,021	329,990
Land and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment	84,594	50,979
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment	378,311	325,100
Building and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment	186,960	147,160
Construction in Progress
Property, Plant and Equipment [Line Items]
Property plant and equipment	39,417	42,879
Other
Property, Plant and Equipment [Line Items]
Property plant and equipment	$ 60,747	$ 46,428