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Income Taxes (Details 5) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance as of August 1 | $ 19,269 | $ 20,715 | $ 17,428
Increases related to current year tax positions | 5,169 | 2,807 | 4,311
Prior year tax positions: |  |  |
Prior year increase | 554 | 2,694 | 1,120
Prior year decrease | (2,079) | (3,605) | 0
Cash settlement | (519) | (1,123) | (412)
Lapse of statute of limitations | (1,072) | (2,219) | (1,732)
Balance at July 31 | $ 21,322 | $ 19,269 | $ 20,715

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