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Accrued Expenses and Other Current Liabilities (Narrative) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Accrued Liabilities, Current [Abstract]    
Minimum coverage period of product warranty from the date of shipment 1 year  
Accrued Expenses And Other Current Liabilities [Line Items]    
Accrued acquisition-related costs $ 9,222,000 $ 7,014,000
UHP    
Accrued Expenses And Other Current Liabilities [Line Items]    
Accrued acquisition-related costs $ 8,705,000