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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Liabilities assumed:    
Goodwill $ 161,075 $ 157,223
Series of Individually Immaterial Business Acquisitions    
Assets acquired:    
Inventories 680  
Property and equipment 28,384  
Total assets 29,064  
Liabilities assumed:    
Accrued expenses 210  
Total liabilities 210  
Net tangible assets acquired 28,854  
Goodwill 3,852  
Total consideration paid $ 32,706