COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands, ft² in Millions |
3 Months Ended |
9 Months Ended |
|
|
Jan. 31, 2016
USD ($)
ft²
Property
Unit
|
Jan. 31, 2015
USD ($)
|
Jan. 31, 2016
USD ($)
ft²
Property
Unit
|
Jan. 31, 2015
USD ($)
|
Apr. 30, 2015
USD ($)
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Total property cost subject to purchase options |
$ 1,801,019
|
|
$ 1,801,019
|
|
$ 1,546,367
|
| Total gross rental revenue from properties subject to purchase options |
50,277
|
$ 46,753
|
$ 142,526
|
$ 135,621
|
|
| Redemption basis |
|
|
one-for-one
|
|
|
| Number of consecutive trading days for valuation |
|
|
10 days
|
|
|
| Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners |
89,400
|
$ 122,000
|
$ 89,400
|
$ 122,000
|
|
| Tenant Improvements |
$ 4,500
|
|
$ 4,500
|
|
|
| Commitment period for tenant improvements |
|
|
12 months
|
|
|
| Subject to Purchase Options [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Number of properties | Property |
15
|
|
15
|
|
|
| Total property cost subject to purchase options |
$ 117,600
|
|
$ 117,600
|
|
|
| Total gross rental revenue from properties subject to purchase options |
|
|
6,800
|
|
|
| Subject to Purchase Options [Member] | Nebraska Orthopaedic Hospital Omaha NE [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Total property cost subject to purchase options |
$ 16,000
|
|
16,000
|
|
|
| Total gross rental revenue from properties subject to purchase options |
|
|
$ 1,300
|
|
|
| Subject to Restrictions on Taxable Dispositions [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Number of properties | Property |
78
|
|
78
|
|
|
| Area of real estate property | ft² |
2.7
|
|
2.7
|
|
|
| Number of apartment units at properties subject to restrictions on taxable dispositions | Unit |
5,372
|
|
5,372
|
|
|
| Real estate investment amount of properties (net of accumulated depreciation) |
$ 670,600
|
|
$ 670,600
|
|
|