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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Apr. 30, 2016
Apr. 30, 2015
Liabilities assumed:    
Goodwill $ 128,566 $ 127,046
Series of Individually Immaterial Business Acquisitions    
Assets acquired:    
Inventories 267  
Property and equipment 5,465  
Other assets 25  
Total assets 5,757  
Liabilities assumed:    
Accrued expenses 14  
Total liabilities 14  
Net tangible assets acquired 5,743  
Goodwill 1,520  
Total consideration paid $ 7,263