Income taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Income Tax Disclosure [Abstract]
Effective tax rates	21.40%	21.20%	21.20%	20.80%
Income tax provision included discrete tax benefit due to share-based payment transactions	$ 115	$ 570	$ 1,539	$ 3,165