XML 53 R39.htm IDEA: XBRL DOCUMENT v3.8.0.1
EQUITY - Share Repurchase Program (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 05, 2017
Dec. 07, 2016
Jan. 31, 2018
Jan. 31, 2018
Share Repurchase Program        
Repurchase period   1 year    
Remaining authorized repurchase amount     $ 38,400,000 $ 38,400,000
Share Repurchase Program [Member]        
Share Repurchase Program        
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased   $ 50,000,000    
Repurchase period 1 year      
Shares repurchased and retired (in shares)     152,000 1,200,000
Aggregate cost of common shares repurchased and retired     $ 882,000 $ 7,100,000
Average cost per share (in dollars per share)     $ 5.82 $ 5.79