Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares shares in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Statement Of Stockholders Equity [Abstract]
Purchase of treasury shares, shares	998,004	180,735	30,148
Dividends declared per share	$ 1.43	$ 1.25	$ 1.11