CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	PREFERRED STOCK [Member]	COMMON SHARES [Member]	ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME [Member]	NONREDEEMABLE NONCONTROLLING INTERESTS [Member]	Series B Preferred Stock [Member]	Series B Preferred Stock [Member] ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME [Member]	Series C Preferred Stock [Member]	Series C Preferred Stock [Member] ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME [Member]
Balance at Apr. 30, 2017	$ 636,158	$ 111,357	$ 908,905	$ (466,541)	$ 0	$ 82,437
Balance (in shares) at Apr. 30, 2017			121,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	229			1,557		(1,328)
Distributions – common shares and units	(18,970)			(16,881)		(2,089)
Distributions - preferred shares	(5,098)						$ (4,571)	$ (4,571)	$ (527)	$ (527)
Shares issued and share-based compensation (in shares)			75
Shares issued and share-based compensation	844		$ 844
Series C preferred shares issued	99,467	99,467
Redemption of units for cash	(5,982)					(5,982)
Shares repurchased (in shares)			(1,080)
Shares repurchased	(121,259)	(111,357)	$ (6,253)	(3,649)
Contributions from nonredeemable noncontrolling interests – consolidated real estate entities	239					239
Distributions to nonredeemable noncontrolling interests – consolidated real estate entities	(41)					(41)
Other (in shares)			(5)
Other	(29)		$ (29)
Balance at Oct. 31, 2017	585,558	99,467	$ 903,467	(490,612)	0	73,236
Balance (in shares) at Oct. 31, 2017			120,189
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment upon adoption of ASC 606 and ASC 610-20	627			627
Adjusted balance	688,190	99,456	$ 900,097	(395,042)	1,779	81,900
Balance at Apr. 30, 2018	687,563	99,456	$ 900,097	(395,669)	1,779	81,900
Balance (in shares) at Apr. 30, 2018			119,526
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	(1,563)			(1,642)		79
Other comprehensive income - derivative instrument	1,542				1,542
Distributions – common shares and units	(18,684)			(16,724)		(1,960)
Distributions - preferred shares	(3,411)								$ (3,411)	$ (3,411)
Shares issued and share-based compensation (in shares)			27
Shares issued and share-based compensation	777		$ 777
Redemption of units for common shares (in shares)			331
Redemption of units for common shares	0		$ 649			(649)
Redemption of units for cash	(482)					(482)
Shares repurchased (in shares)			(119)
Shares repurchased	(615)		$ (615)
Distributions to nonredeemable noncontrolling interests – consolidated real estate entities	(2,374)					(2,374)
Other (in shares)			(38)
Other	(643)		$ (382)			(261)
Balance at Oct. 31, 2018	$ 662,737	$ 99,456	$ 900,526	$ (416,819)	$ 3,321	$ 76,253
Balance (in shares) at Oct. 31, 2018			119,727