STOCKHOLDERS' EQUITY, Authorized Stock, Preferred Stock and Common Stock (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018 USD ($) Director $ / shares shares	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Oct. 31, 2017 USD ($) $ / shares shares	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2018 USD ($) Vote Quarter Director $ / shares shares	Oct. 31, 2017 USD ($) Vote $ / shares shares	Oct. 31, 2016 USD ($) shares
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Shares authorized (in shares) | shares	200,000,000								200,000,000
Excess stock, shares authorized (in shares) | shares	20,000,000				20,000,000				20,000,000	20,000,000
Repayment of unsecured revolving credit facility | $									$ 9,000	$ 56,000	$ 66,750
Proceeds from issuance of common stock | $									$ 196	$ 200	73,842
Excess stock issuance threshold ownership percentage	7.50%				7.50%				7.50%	7.50%
Proceeds from Issuance of Preferred Stock and Preference Stock | $									$ 0	$ 111,328	0
Income statement effect of redememption of preferred stock | $	$ 0	$ 0	$ 0	$ 0	$ 4,075	$ 0	$ 0	$ 0	$ 0	$ 4,075	$ 0
Minimum [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Class A Common Stock dividend per share to Common Stock dividend per share									110.00%	110.00%
January 19, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Jan. 19, 2018
April 16, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Apr. 16, 2018
July 20, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Jul. 20, 2018
October 19, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Oct. 19, 2018
January 20, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Jan. 20, 2017
April 17, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Apr. 17, 2017
July 17, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Jul. 17, 2017
October 20, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Dividend payment date									Oct. 20, 2017
Common Shares [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Common stock, shares authorized (in shares) | shares	30,000,000				30,000,000				30,000,000	30,000,000
Voting rights per share | Vote									1	1
Common Stock available for issuance (in shares) | shares	338,406								338,406
Gross dividend paid per share (in dollars per share)									$ 0.96	$ 0.94
Ordinary income (in dollars per share)									0.6456	0.560
Capital gain (in dollars per share)									0.0152	0.083
Non-taxable portion (in dollars per share)									0.2992	0.297
Common Shares [Member] | January 19, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.24
Ordinary income (in dollars per share)									0.1614
Capital gain (in dollars per share)									0.0038
Non-taxable portion (in dollars per share)									0.0748
Common Shares [Member] | April 16, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.24
Ordinary income (in dollars per share)									0.1614
Capital gain (in dollars per share)									0.0038
Non-taxable portion (in dollars per share)									0.0748
Common Shares [Member] | July 20, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.24
Ordinary income (in dollars per share)									0.1614
Capital gain (in dollars per share)									0.0038
Non-taxable portion (in dollars per share)									0.0748
Common Shares [Member] | October 19, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.24
Ordinary income (in dollars per share)									0.1614
Capital gain (in dollars per share)									0.0038
Non-taxable portion (in dollars per share)									$ 0.0748
Common Shares [Member] | January 20, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.235
Ordinary income (in dollars per share)										0.14
Capital gain (in dollars per share)										0.02075
Non-taxable portion (in dollars per share)										0.07425
Common Shares [Member] | April 17, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.235
Ordinary income (in dollars per share)										0.14
Capital gain (in dollars per share)										0.02075
Non-taxable portion (in dollars per share)										0.07425
Common Shares [Member] | July 17, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.235
Ordinary income (in dollars per share)										0.14
Capital gain (in dollars per share)										0.02075
Non-taxable portion (in dollars per share)										0.07425
Common Shares [Member] | October 20, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.235
Ordinary income (in dollars per share)										0.14
Capital gain (in dollars per share)										0.02075
Non-taxable portion (in dollars per share)										$ 0.07425
Class A Common Shares [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Common stock, shares authorized (in shares) | shares	100,000,000				100,000,000				100,000,000	100,000,000
Voting rights per share | Vote									0.05	0.05
Common Stock available for issuance (in shares) | shares	393,150								393,150
Gross dividend paid per share (in dollars per share)									$ 1.08	$ 1.06
Ordinary income (in dollars per share)									0.728	0.632
Capital gain (in dollars per share)									0.016	0.093
Non-taxable portion (in dollars per share)									0.336	0.335
Class A Common Shares [Member] | January 19, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.27
Ordinary income (in dollars per share)									0.182
Capital gain (in dollars per share)									0.004
Non-taxable portion (in dollars per share)									0.084
Class A Common Shares [Member] | April 16, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.27
Ordinary income (in dollars per share)									0.182
Capital gain (in dollars per share)									0.004
Non-taxable portion (in dollars per share)									0.084
Class A Common Shares [Member] | July 20, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.27
Ordinary income (in dollars per share)									0.182
Capital gain (in dollars per share)									0.004
Non-taxable portion (in dollars per share)									0.084
Class A Common Shares [Member] | October 19, 2018 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)									0.27
Ordinary income (in dollars per share)									0.182
Capital gain (in dollars per share)									0.004
Non-taxable portion (in dollars per share)									0.084
Class A Common Shares [Member] | January 20, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.265
Ordinary income (in dollars per share)										0.158
Capital gain (in dollars per share)										0.02325
Non-taxable portion (in dollars per share)										0.08375
Class A Common Shares [Member] | April 17, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.265
Ordinary income (in dollars per share)										0.158
Capital gain (in dollars per share)										0.02325
Non-taxable portion (in dollars per share)										0.08375
Class A Common Shares [Member] | July 17, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.265
Ordinary income (in dollars per share)										0.158
Capital gain (in dollars per share)										0.02325
Non-taxable portion (in dollars per share)										0.08375
Class A Common Shares [Member] | October 20, 2017 [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Gross dividend paid per share (in dollars per share)										0.265
Ordinary income (in dollars per share)										0.158
Capital gain (in dollars per share)										0.02325
Non-taxable portion (in dollars per share)										$ 0.08375
Series F Cumulative Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Liquidation preference (in dollars per share)	$ 25.00								$ 25.00
Preferred stock, dividend rate									7.125%	7.125%	7.125%
Series I & J Participating Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Preferred shares purchaseable per right (in shares) | shares	0.01								0.01
Exercise price per right (in dollars per right)	$ 85								$ 85
Value of common shares as a multiple of the exercise price of the right	200.00%								200.00%
Series I & J Participating Preferred Stock [Member] | Minimum [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Percentage of combined voting power of Common Shares to trigger rights distribution	10.00%								10.00%
Percentage of ownership offer to trigger rights distribution	30.00%								30.00%
Series G Senior Redeemable Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Liquidation preference (in dollars per share)	$ 25				$ 25				$ 25	$ 25
Preferred stock, dividend rate				6.75%					6.75%	6.75%	6.75%
Series H Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Liquidation preference (in dollars per share)	$ 25				$ 25				$ 25	$ 25
Preferred stock, dividend rate									6.25%	6.25%	6.25%
Common Stock [Member] | Common Shares [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Shares issued under the dividend reinvestment plan (in shares) | shares									4,528	4,705	4,988
Common Stock [Member] | Class A Common Shares [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Shares issued (in shares) | shares											3,162,500
Shares issued under the dividend reinvestment plan (in shares) | shares									5,766	5,399	5,854
Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Preferred stock, shares authorized (in shares) | shares	50,000,000				50,000,000				50,000,000	50,000,000
Preferred Stock [Member] | Series F Cumulative Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Share Price (in dollars per share)					$ 25.00					$ 25.00
Income statement effect of redememption of preferred stock | $										$ 4,100
Preferred Stock [Member] | Series G Senior Redeemable Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Redemption price (in dollars per share)	$ 25								$ 25
Preferred stock, dividend rate									6.75%
Number of quarters with cumulative arrearage of quarterly dividends to trigger the election of additional board members by holders of preferred stock | Quarter									6
Number of directors redeemable preferred stockholders are entitled to elect | Director	2								2
Redemption date of preferred stock									Oct. 28, 2019
Preferred Stock [Member] | Series H Preferred Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Redemption price (in dollars per share)	$ 25								$ 25
Preferred stock, dividend rate									6.25%
Number of quarters with cumulative arrearage of quarterly dividends to trigger the election of additional board members by holders of preferred stock | Quarter									6
Number of directors redeemable preferred stockholders are entitled to elect | Director	2								2
Redemption date of preferred stock									Sep. 18, 2022
Excess Stock [Member]
Authorized Stock, Preferred Stock, and Common Stock [Abstract]
Excess stock, shares authorized (in shares) | shares	20,000,000				20,000,000				20,000,000	20,000,000