Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 451,081	$ 420,819	$ 405,911	$ 452,554	$ 433,740	$ 431,235	$ 411,861	$ 406,416	$ 1,730,365	$ 1,683,252	$ 1,692,422
Long-Lived Assets	71,830				72,798				71,830	72,798
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,679,905	1,622,163	1,625,173
Long-Lived Assets	69,961				71,000				69,961	71,000
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									50,460	61,089	$ 67,249
Long-Lived Assets	$ 1,869				$ 1,798				$ 1,869	$ 1,798