STOCKHOLDERS' EQUITY (Details) (USD $)	6 Months Ended		12 Months Ended	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Oct. 31, 2014	Apr. 30, 2015
Equity, Class of Treasury Stock [Line Items]
Shares authorized (in shares)	200,000,000			200,000,000
Common stock, shares authorized (in shares)	30,000,000			30,000,000
Excess Stock, shares authorized (in shares)	20,000,000		20,000,000	20,000,000
Preferred Stock, shares authorized (in shares)	50,000,000			50,000,000
Proceeds from issuance of preferred stock	$ 4,648,000	$ 0
Proceeds received from sale of Class A Common Stock	59,854,000	123,000
Original Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased (in shares)	1,500,000			1,500,000
Current Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased (in shares)	2,000,000			2,000,000
Common Stock [Member] | Original Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)	4,600
Class A Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000		100,000,000	100,000,000
Overallotment option shares issued (in shares)	375,000
Proceeds from issuance of stock via exercise of overallotment option	7,800,000
Class A common stock issued (in shares)	2,500,000
Price of Class A commons stock issued (in dollars per share)	$ 20.82			$ 20.82
Proceeds received from sale of Class A Common Stock	52,100,000
Class A Common Stock [Member] | Original Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)	724,578
Series D Senior Cumulative Preferred Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred stock, redemption price per share (in dollars per share)	$ 25.00			$ 25.00
Series F Senior Redeemable Preferred Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred stock, redemption price per share (in dollars per share)	$ 25.00			$ 25.00
Number of directors redeemable preferred stockholders are entitled to elect	2			2
Preferred stock, dividend rate (in hundredths)	7.125%		7.125%
Series G Senior Redeemable Preferred Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred stock, redemption price per share (in dollars per share)	$ 25.00			$ 25.00
Number of directors redeemable preferred stockholders are entitled to elect	2			2
Preferred stock issued (in shares)			2,800,000
Preferred stock, dividend rate (in hundredths)	6.75%		6.75%
Proceeds from issuance of preferred stock			67,800,000
Preferred stock, redemption date	Oct. 28, 2019
Overallotment option shares issued (in shares)	200,000
Proceeds from issuance of stock via exercise of overallotment option	4,800,000
Restricted Stock [Member]
Non-vested shares, weighted-average grant-date fair value [Roll forward]
Unamortized restricted stock compensation	14,900,000			14,900,000
Weighted average period for recognizing unamortized expense				5 years
Total amounts charged to compensation expense	1,907,000	1,993,000
Restricted Stock [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	350,000			350,000
Number of shares awarded (in shares)	152,000
Non-vest shares, number of shares [Roll forward]
Non-vested, beginning of period (in shares)	1,380,800
Granted (in shares)	152,000
Vested (in shares)	(250,950)
Forfeiture of restricted stock (in shares)	0
Non-vested, end of period (in shares)	1,281,850			1,281,850
Non-vested shares, weighted-average grant-date fair value [Roll forward]
Non-vested, beginning of period (in dollars per share)	$ 16.21
Granted (in dollars per share)	$ 18.37
Vested (in dollars per share)	$ 15.66
Forfeiture of restricted stock (in dollars per share)	$ 0
Non-vested, end of period (in dollars per share)	$ 16.58			$ 16.58
Restricted Stock [Member] | Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	350,000			350,000
Number of shares awarded (in shares)	92,750
Non-vest shares, number of shares [Roll forward]
Non-vested, beginning of period (in shares)	399,950
Granted (in shares)	92,750
Vested (in shares)	(87,400)
Forfeiture of restricted stock (in shares)	(26,000)
Non-vested, end of period (in shares)	379,300			379,300
Non-vested shares, weighted-average grant-date fair value [Roll forward]
Non-vested, beginning of period (in dollars per share)	$ 18.01
Granted (in dollars per share)	$ 22.10
Vested (in dollars per share)	$ 15.88
Forfeiture of restricted stock (in dollars per share)	$ 19.46
Non-vested, end of period (in dollars per share)	$ 19.38			$ 19.38
Restricted Stock [Member] | Class A Common shares or Common shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	3,050,000			3,050,000
Restricted Stock Plan [Member] | Restricted Stock [Member] | Class A Common shares or Common shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	3,750,000			3,750,000
Grant date fair value	$ 4,800,000