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Schedule of Difference Between Basic and Diluted EPS as Result of Restricted Stock Units and Unvested Restricted Stock (Detail) - shares | 12 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Earnings Per Share [Abstract] |  |  |
Weighted-average shares outstanding for basic earnings per share | 52,674,161 | 52,562,723 | 52,458,789
Unvested restricted stock and restricted stock units | 179,199 | 195,719 | 131,727
Weighted-average shares outstanding assuming dilution | 52,853,360 | 52,758,442 | 52,590,516

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