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Stock-Based Compensation - Employee Stock Purchase Plan Activity (Details) - Employee Stock Purchase Plan - $ / shares | Jan. 31, 2019 | Jul. 31, 2018
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Stock-Based Compensation |  |
Shares issued (in shares) | 209,985 | 240,807
Fair market value at purchase date (in dollars per share) | $ 10.15 | $ 8.67

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