Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares shares in Thousands	3 Months Ended						12 Months Ended
	Jul. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2020	Oct. 31, 2019
Statement of Stockholders' Equity [Abstract]
Accounting Standards Update [Extensible List]							Accounting Standards Update 2016-13	us-gaap:AccountingStandardsUpdate201602Member
Purchase of treasury shares, shares	76,724	127,297	27,347	53,735	300,894	26,223
Dividends declared per share	$ 0.39	$ 0.39	$ 0.39	$ 0.38	$ 0.38	$ 0.38