XML 41 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Net Income per Common Share - Additional Informations (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Class A nonvoting common stock        
Earnings Per Share [Line Items]        
Common stock of Class A shares excluded from computations of diluted net income per share 705 769 721 770