Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		1 Months Ended	3 Months Ended				9 Months Ended
	Aug. 18, 2021	Jun. 30, 2021	Jul. 31, 2021		Jul. 31, 2020	[2]	Jul. 31, 2021	Jul. 31, 2020	[2]	Jun. 17, 2021
Accelerated Share Repurchases [Line Items]
Stock repurchase program authorized amount										$ 500.0
Remaining amount available for further repurchases			$ 325.0				$ 325.0
Purchases of treasury stock (in shares)			521	[1]	149		2,114	1,380
June 2021, ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program authorized amount		$ 175.0
Prepayment to repurchase stock		175.0
Initial share delivery		$ 140.0
June 2021, ASR | Subsequent Event
Accelerated Share Repurchases [Line Items]
Stock repurchase program, prepayment during prior period, future derivative settlement	$ 35.0
Purchases of treasury stock (in shares)	600
Purchases of treasury stock (in USD per share)	$ 282.13

[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.