SUBSEQUENT EVENTS (Details) - $ / shares	9 Months Ended
	Jan. 31, 2016	Mar. 08, 2016
Common Shares and Limited Partnership Units [Member]
Subsequent Event [Line Items]
Date declared	Mar. 08, 2016
Record date	Mar. 21, 2016
Payment date	Apr. 01, 2016
Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Date declared	Mar. 08, 2016
Record date	Mar. 21, 2016
Payment date	Mar. 31, 2016
Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Date declared	Mar. 08, 2016
Record date	Mar. 21, 2016
Payment date	Mar. 31, 2016
Subsequent Event [Member] | Common Shares and Limited Partnership Units [Member]
Subsequent Event [Line Items]
Quarterly amount per share or unit (in dollars per share)		$ 0.1300
Subsequent Event [Member] | Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Quarterly amount per share or unit (in dollars per share)		0.5156
Subsequent Event [Member] | Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Quarterly amount per share or unit (in dollars per share)		$ 0.4968