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Acquisition of Versature Corp. (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
Business Combinations [Abstract] |  |  |
Revenues | $ 1,410,056 | $ 1,553,815 | $ 1,506,758
Net income | $ 121 | $ 5,148 | $ 9,185

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