Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended				6 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2023	Jul. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0	$ 2.28	$ 0	$ 2.24	$ 2.28	$ 2.24