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Acquisitions (Acquisition Plan Expenses) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Business Acquisition [Line Items]        
Acquisition plan expenses $ 3,357,000 $ 6,025,000 $ 94,540,000 $ 8,414,000
Incremental interest expense on financing commitment letter     1,178,000  
Gilat        
Business Acquisition [Line Items]        
Payments of acquisition expenses $ 70,000,000      
Gilat        
Business Acquisition [Line Items]        
Acquisition plan expenses     $ 88,343,000