Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment		$ 1,362,120
Lease right-of-use assets - operating	$ 32,253
Lease right-of-use assets - finance	3,808
Total cost	1,395,970
Less accumulated depreciation	(316,294)
Property, plant and equipment, net	1,079,676
Total cost		1,362,120
Less accumulated depreciation		(269,649)
Property, plant and equipment, net	1,079,676	1,092,471
Land
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	129,441	142,475
Total cost	129,441	142,475
Building and improvements
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	738,536	742,736
Total cost	738,536	742,736
Machinery and equipment
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	409,810	389,666
Total cost	409,810	389,666
Rental vehicles
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	82,122	87,243
Total cost	$ 82,122	$ 87,243