Stock Repurchase Program - Additional Information (Detail) - USD ($) shares in Thousands	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Apr. 05, 2018
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount	$ 500,000,000		$ 500,000,000
Remaining amount available for further repurchases	$ 295,800,000
Purchases of treasury stock (in shares)	346	1,987
Accelerated Share Repurchase Program September 2017
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, prepayment during prior period, derivative settlement		$ 20,000,000.0