Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Property, Plant and Equipment [Line Items]
Total cost	$ 772,572	$ 723,531
Less accumulated depreciation	(222,101)	(201,477)
Net property, plant and equipment	550,471	522,054
Land
Property, Plant and Equipment [Line Items]
Total cost	62,184	57,413
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Total cost	499,252	468,824
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 211,136	$ 197,294