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Description of Business and Summary of Significant Accounting Policies (Details) - shares shares in Thousands | 12 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Summary of weighted-average number of shares used in calculation of basic and diluted earnings per share |  |  |
Basic weighted-average number of shares | 24,655 | 23,182 | 22,765
Effect of dilutive securities: |  |  |
Stock options | 9 | 44 | 6
Non-vested restricted Class B common stock | 54 | 83 | 44
Diluted weighted-average number of shares | 24,718 | 23,309 | 22,815

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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