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Supplementary Balance Sheet Information (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Balance Sheet Related Disclosures [Abstract]      
Finite-Lived Intangible Assets, Amortization Expense, Year Two $ 4,661    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 4,661    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4,661    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 4,661    
Depreciation expense 210,700 $ 199,200 $ 180,800
Amortization of Intangible Assets $ 7,400 $ 5,300 $ 8,300