Earnings per Share - Exclusions from Calculation of Weighted-Average Shares Outstanding Assuming Dilution Due to Anti-Dilutive Effect of Common Stock Equivalents (Detail) - shares	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive common stock equivalents	3,493,183	489,528	4,325,806	2,780,214
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive common stock equivalents	627,600	48,951	779,600	988,551
Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive common stock equivalents	2,865,583	422,169	3,546,206	1,773,255
Performance Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive common stock equivalents	0	18,408	0	18,408