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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2021
Apr. 30, 2022
Apr. 30, 2022
Apr. 24, 2021
Apr. 25, 2020
Asset Acquisition [Line Items]          
Cash consideration paid     $ 19,793 $ 0 $ 0
Goodwill   $ 140,630 $ 140,630 $ 139,932  
Miller Vet Holdings, LLC          
Asset Acquisition [Line Items]          
Cash consideration paid $ 19,793        
Liabilities assumed 6,799        
Total identifiable intangible assets 14,000        
Goodwill 1,063        
Tangible assets $ 4,796        
Goodwill decrease   $ 66