Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended				9 Months Ended
	May 31, 2020	Jul. 31, 2021	[1]	Jul. 31, 2020	[2]	Jul. 31, 2021	Jul. 31, 2020	[2]
Stock Repurchase Program [Abstract]
Purchases of treasury stock (in shares)		521,000		149,000		2,114,000	1,380,000
Aggregate purchased shares		$ 140,000		$ 20,000		$ 538,082	$ 200,000
Reissuance of treasury stock		564,000		999,000		2,093,000	2,807,000
Accelerated Share Repurchases [Line Items]
Share repurchases settlement of equity forward (in shares)	148,953					99,573
June 2021, ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program, prepayment during period, derivative settlement						$ 35,000
February 2020, ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program, prepayment during period, derivative settlement	$ 20,000

[1] Does not include the 99,573 shares and $35.0 million equity forward contract from the June 2021 ASR.

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