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Stock-Based Compensation - Employee Stock Purchase Plan Activity (Details) - Employee Stock Purchase Plan - $ / shares | Jan. 31, 2017 | Jul. 29, 2016
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Stock-Based Compensation |  |
Shares issued (in shares) | 269,102 | 410,737
Fair market value at purchase date (in dollars per share) | $ 6.77 | $ 4.76

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