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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Feb. 01, 2019
Jul. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 1,362,120   $ 723,531
Accumulated depreciation 269,649   201,477
Increase Decrease In Property Plant And Equipment Net 570,417    
Erwin Hymer Group [Member]      
Property, Plant and Equipment [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 522,830 $ 447,621  
Assets Held under Capital Leases      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 6,527   6,527
Accumulated depreciation $ 2,312   $ 1,768