CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended	12 Months Ended
	Jan. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Common Stock [Member]
Common stock, dividends per share declared (in dollars per share)		$ 0.96	$ 0.94	$ 0.92
Class A Common Stock [Member]
Common stock, dividends per share declared (in dollars per share)		$ 1.08	$ 1.06	$ 1.04
6.75% Series G Preferred Stock [Member]
Preferred stock, dividend rate	6.75%	6.75%	6.75%	6.75%
7.125% Series F Preferred Stock [Member]
Preferred stock, dividend rate		7.125%	7.125%	7.125%
6.25% Series H Preferred Stock [Member]
Preferred stock, dividend rate		6.25%	6.25%	6.25%