EQUITY (Details) - USD ($)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Aggregate offering price	$ 75,000,000
Units converted to common shares (in shares)	78,000	3,100,000
Units converted to common shares	$ 576,000	$ 18,300,000
2008 Incentive Award Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Shares issued (in shares)	220,000	204,000
Shares issued	$ 1,600,000	$ 1,900,000
Restricted shares (in shares)	108,000
Distribution Reinvestment and Share Purchase Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Shares issued (in shares)	766,000	2,400,000
Shares issued	$ 5,200,000	$ 20,900,000
Shares registered (in shares)	10,000
Average price of shares issued (in dollars per share)	$ 6.84	$ 8.64
Distribution Reinvestment Waiver [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Shares issued (in shares)		926,000
Shares issued		$ 8,000,000
Average price of shares issued (in dollars per share)		$ 8.64