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Stockholders' Equity (Tables)
 6 Months Ended
Jan. 31, 2019
Equity [Abstract]  
Schedule of Change in Retained Earnings
The components of the change in retained earnings are as follows:
 
Balance as of July 31, 2018
 
$
2,022,988
 
Cumulative effect of the adoption of ASU No. 2014-09, net of tax
 
 
(5,450
) 
Net income
 
 
8,536
 
Dividends declared and paid
 
 
(41,189
) 
 
 
 
 
 
Balance as of January 31, 2019
 
$
1,984,885