Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 300,055	$ 294,883	$ 297,340	$ 247,666	$ 264,170	$ 256,847	$ 273,031	$ 247,938	$ 1,139,944	$ 1,041,986	$ 1,065,834
Long-Lived Assets	358,491				309,775				358,491	309,775	310,606
Reportable Geographical Components [Member] | United States
Segment Reporting Information [Line Items]
Net revenues									831,782	839,013	888,164
Long-Lived Assets	234,690				235,663				234,690	235,663	243,225
Reportable Geographical Components [Member] | Europe
Segment Reporting Information [Line Items]
Net revenues									266,679	169,398	143,281
Long-Lived Assets	95,763				53,569				95,763	53,569	48,709
Reportable Geographical Components [Member] | Rest of World
Segment Reporting Information [Line Items]
Net revenues									41,483	33,575	34,389
Long-Lived Assets	$ 28,038				$ 20,543				$ 28,038	$ 20,543	$ 18,672
Sales [Member] | Rest of World
Segment Reporting Information [Line Items]
Concentration Risk, Percentage									27.00%	19.50%	16.70%