Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Jul. 31, 2020
Property, Plant, Equipment, and ROU Assets [Line Items]
Lease right-of-use assets – operating	$ 38,545	$ 33,609
Lease right-of-use assets – finance	7,196	3,672
Total cost	1,577,625	1,456,986
Less accumulated depreciation	(419,245)	(349,337)
Property, plant and equipment, net	1,158,380	1,107,649
Land
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	141,166	136,200
Buildings and improvements
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	815,802	760,986
Machinery and equipment
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	509,924	438,985
Rental vehicles
Property, Plant, Equipment, and ROU Assets [Line Items]
Property, plant and equipment	$ 64,992	$ 83,534