Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	[1]	Jul. 31, 2020	[2]	Jul. 31, 2019	[1],[3]
Stock Repurchase Program [Abstract]
Purchases of treasury stock (in shares)	149	775		1,380		1,901
Aggregate purchased shares	$ 20,000	$ 100,000		$ 200,000		$ 209,185
Reissuance of treasury stock	999	1,166		2,807		3,009

[1] Does not include the 90,202 shares or $20.0 million equity forward contract from the June 2019 ASR settled in August 2019.

[2] The third quarter of fiscal 2020 includes the settlement of the 148,953 shares or $20.0 million equity forward contract from the February 2020 ASR settled in May 2020.

[3] The third quarter of fiscal 2019 includes the settlement of the 97,601 shares or $20.0 million equity forward contract from the February 2019 ASR settled in May 2019.