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Summary of Activity for Time-Based Stock Awards (Parenthetical) (Detail)
6 Months Ended
Jan. 31, 2018
shares
Time Based Stock Awards  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Time based stock awards granted 6,100 [1]
Time based stock awards Vested 15,672 [2]
Time Based Stock Awards | Non-Employee Directors  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Time based stock awards granted 4,100
Time based stock awards Vested 4,100
Time Based Restricted Stock Awards  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Restricted stock converting in to common stock, description Upon vesting, each RSU was converted to one share of common stock.
Stock issued during period shares for each unit converted 1
Time Based Restricted Stock Awards | Employees and Executives  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Time based stock awards Vested 11,572
[1] Includes 4,100 shares granted to non-employee directors for service during the six months ended January 31, 2018.
[2] Includes 4,100 shares granted to non-employee directors for service for the six months ended January 31, 2018. The shares vest on the date of grant, and the Company recognizes compensation expense on such date. Includes 11,572 time-based RSU awards granted to certain employees and executives, and the Company recognizes compensation expense related to the awards over the respective service periods in accordance with GAAP. Upon vesting, each RSU was converted to one share of common stock.