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Income Taxes (Details 2) |  |  | 12 Months Ended
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Jul. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |  |
Federal statutory rate | 21.00% | 35.00% | 26.90% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit |  |  | 1.30% | 1.30% | 0.90%
International rate differential |  |  | (0.80%) | (1.80%) | (1.80%)
Compensation and fringe benefits (1) |  |  | (3.50%) | (24.30%) | (3.60%)
Provisional transition tax |  |  | 2.20% | 0.00% | 0.00%
Deferred tax remeasurement |  |  | (0.80%) | 0.00% | 0.00%
Other differences |  |  | 0.40% | 0.20% | 1.20%
Effective Income Tax Rate Reconciliation, Percent |  |  | 25.70% | 10.40% | 31.70%

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