Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 433,740	$ 431,235	$ 411,861	$ 406,416	$ 430,795	$ 428,691	$ 412,700	$ 420,236	$ 1,683,252	$ 1,692,422	$ 1,532,111
Long-Lived Assets	72,798				52,428				72,798	52,428
US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,622,163	1,625,173	1,470,693
Long-Lived Assets	71,000				50,459				71,000	50,459
Non-US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									61,089	67,249	$ 61,418
Long-Lived Assets	$ 1,798				$ 1,969				$ 1,798	$ 1,969