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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Liabilities assumed:    
Goodwill $ 140,258 $ 132,806
Series of Individually Immaterial Business Acquisitions    
Assets acquired:    
Inventories 1,618  
Property and equipment 28,090  
Total assets 29,708  
Liabilities assumed:    
Accrued expenses 0  
Total liabilities 0  
Net tangible assets acquired 29,708  
Goodwill 7,452  
Total consideration paid $ 37,160