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Acquisitions (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Business Combinations [Abstract] |  |  |  |
Revenues | $ 323,890 | $ 349,473 | $ 664,089 | $ 712,673
Net income (loss) | $ 904 | $ (1,011) | $ (518) | $ (3,217)

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