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Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Jul. 31, 2021
Revenue from Contract with Customer [Abstract]          
Allowance for doubtful accounts $ 0   $ 0   $ 0
Contract costs, current 14,717,000   14,717,000   13,365,000
Contract costs, noncurrent 29,331,000   29,331,000   $ 28,870,000
Amortization of contract costs 3,300,000 $ 3,100,000 6,310,000 $ 5,355,000  
Contract with customer, liability, revenue recognized 39,000,000   107,000,000    
Remaining performance obligation, amount $ 908,000,000   $ 908,000,000