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Income Taxes (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jul. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Income Tax Contingency [Line Items]      
Provisional tax expense $ 503,700    
Remeasurement of net DTA 431,300    
U.S. transition tax 45,600    
Unrecognized deferred income tax liability 23,000    
Cumulative adjustment     $ 62,123
Deferred tax asset, net 724,087   1,155,104
Valuation allowance $ 144,865   185,898
Scenario, Forecast      
Income Tax Contingency [Line Items]      
Blended federal tax rate   23.40%  
Retained earnings      
Income Tax Contingency [Line Items]      
Cumulative adjustment     61,291
ASU 2016-09, Excess tax benefit component      
Income Tax Contingency [Line Items]      
Deferred tax asset, net     62,100
ASU 2016-09, Excess tax benefit component | Retained earnings      
Income Tax Contingency [Line Items]      
Cumulative adjustment     $ 62,100