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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Liabilities assumed:    
Goodwill $ 157,223 $ 140,258
Series of Individually Immaterial Business Acquisitions    
Assets acquired:    
Inventories 1,724  
Property and equipment 49,698  
Total assets 51,422  
Liabilities assumed:    
Accrued expenses 187  
Total liabilities 187  
Net tangible assets acquired 51,235  
Goodwill 16,965  
Total consideration paid $ 68,200