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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Apr. 24, 2021
Asset Acquisition [Line Items]      
Cash consideration paid $ 19,793 $ 0  
Goodwill 140,985   $ 139,932
Miller Vet Holdings, LLC      
Asset Acquisition [Line Items]      
Cash consideration paid 19,793    
Liabilities assumed 6,395    
Identifiable intangibles 14,000    
Goodwill 1,063    
Tangible assets $ 4,730