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Income Taxes - Reconciliation (Details)
3 Months Ended 6 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Income Tax Disclosure [Abstract]        
Effective Rate 25.70% (3.60%) 25.30% 11.90%
Deferred tax revaluation 27.50%   13.70%  
U.S. federal statutory rate decrease (5.80%)   (5.80%)  
Prior quarter true-up due to U.S. federal statutory rate decrease 8.20%   0.00%  
Foreign operations (1.80%)   1.60%  
State taxes 0.10%   0.50%  
Excess tax benefit (0.90%)   1.20%  
Other 2.00%   2.20%