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Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Oct. 31, 2016
Geographic Information About Revenues and Long-Lived Assets [Line Items]          
Revenue $ 374,632 $ 323,290 $ 729,591 $ 654,846  
US [Member]          
Geographic Information About Revenues and Long-Lived Assets [Line Items]          
Revenue 359,342 310,751 699,902 629,860  
Long-Lived Assets 44,141   44,141   $ 42,153
Non-US [Member]          
Geographic Information About Revenues and Long-Lived Assets [Line Items]          
Revenue 15,290 12,539 29,689 24,986  
Long-Lived Assets 2,200   2,200   2,274
Total [Member]          
Geographic Information About Revenues and Long-Lived Assets [Line Items]          
Revenue 374,632 $ 323,290 729,591 $ 654,846  
Long-Lived Assets $ 46,341   $ 46,341   $ 44,427