Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			6 Months Ended
	Feb. 28, 2022	Mar. 31, 2021	Apr. 30, 2022	[1]	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Stock Repurchase Program [Abstract]
Purchases of treasury stock (in shares)			984,000		756,000	1,685,000	1,593,000
Aggregate purchased shares			$ 290,000		$ 195,211	$ 535,000	$ 398,082
Reissuance of treasury stock			683,000		946,000	1,578,000	1,529,000
Accelerated Share Repurchases [Line Items]
Share repurchases settlement of equity forward (in shares)	161,215	166,726
December 2021, ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program, prepayment during period, derivative settlement	$ 40,000
December 2020, ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program, prepayment during period, derivative settlement		$ 50,000

[1] Included the 161,215 shares and $40.0 million equity forward contract from the December 2021 ASR settled in February 2022.