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