COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended																		12 Months Ended		3 Months Ended				12 Months Ended	3 Months Ended				3 Months Ended						3 Months Ended
	Jul. 31, 2014 Unit Property sqft		Jul. 31, 2013	Jul. 31, 2014 Commons at Southgate, Minot, North Dakota [Member] Unit		Jul. 31, 2014 Bismarck, North Dakota [Member] Property One [Member] Unit	Jul. 31, 2014 Bismarck, North Dakota [Member] Property Two [Member] Unit	Jul. 31, 2014 Cardinal Point, Grand Forks, North Dakota [Member] Unit		Jul. 31, 2014 Cypress Court - St. Cloud, MN [Member] Unit		Jul. 31, 2014 Grand Forks, ND [Member] Unit	Jul. 31, 2014 Arcata Apartments, Golden Valley, Minnesota [Member] Unit		Jul. 31, 2014 Chateau II, Minot, North Dakota [Member] Unit		Apr. 30, 2014 Chateau II, Minot, North Dakota [Member]		Apr. 30, 2014 Fargo, ND [Member]	Apr. 30, 2014 St. Cloud, MN [Member]	Jul. 31, 2014 Deer Ridge - Jamestown, ND [Member] Unit		Jul. 31, 2014 RED 20 - Minneapolis, MN [Member] sqft Unit		Apr. 30, 2014 Maple Grove, MN [Member]	Jul. 31, 2014 71 France Phase I - Edina, MN [Member] Unit		Jul. 31, 2014 71 France Phase I - Edina, MN [Member] Footnote (7) [Member]		Jul. 31, 2014 PrairieCare Medical - Brooklyn Park, MN [Member] sqft		Jul. 31, 2014 Renaissance Heights I Apartments, Williston, North Dakota [Member] Unit		Jul. 31, 2014 Renaissance Heights I Apartments, Williston, North Dakota [Member] Project Phase One [Member]		Jul. 31, 2014 Edina 6565 France SMC III - Edina, MN [Member] sqft		Jul. 31, 2014 Minot Wells Fargo Bank - Minot, ND [Member] sqft		Jul. 31, 2014 Roseville 3075 Long Lake Rd - Roseville, MN [Member] sqft		Jul. 31, 2014 Vacant land in Monticello, MN [Member] sqft	Jul. 31, 2014 Other [Member]
Real Estate Properties [Line Items]
Number of properties subject to purchase options	15
Total property cost subject to purchase options	$ 120,500,000
Total gross rental revenue from properties subject to purchase options	2,600,000
Number of properties subject to restrictions on taxable dispositions	110
Area of a real estate property	5,300,000																						10,625	[1]						75,000						72,012		4,998		202,807		12,700,000
Number of apartment units placed in service	5,106					68	119					74
Real estate investment amount of properties (net of accumulated depreciation)	827,500,000
Redemption basis	one-for-one
Period to hold the beneficial interest, minimum	1 year
Number of consecutive trading days for valuation	10 days
Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners	154,400,000		197,700,000
Joint ventures partner's interest acquired	0
Tenant Improvements	8,700,000
Commitment period for tenant improvements	12 months
Number of apartment units				233	[2]			251		66	[3]		165		72	[4]					163		130	[1]		109						288	[5]
Anticipated Total Cost	354,552,000			37,201,000	[2]			40,042,000		7,028,000	[3]		33,448,000		14,711,000	[4]					24,519,000		29,462,000	[1]		29,660,000		69,900,000	[6]	24,251,000		62,362,000	[5]			34,665,000		3,288,000		13,915,000
Project costs incurred to date	153,964,000	[7]		33,218,000	[2],[7]			9,333,000	[7]	3,168,000	[3],[7]		19,048,000	[7]	5,681,000	[4],[7]					1,793,000	[7]	20,399,000	[1],[7]		4,255,000	[7]			4,486,000	[7]	44,251,000	[5],[7]	23,000,000	[5]	4,204,000	[7]	1,550,000	[7]	2,578,000	[7]		874,000	[7]
Estimated quarter for completion	189,193,000			24,480,000	[2]			24,500,000		4,200,000	[3]		24,250,000		0	[4]					0		21,726,000	[1]		20,365,000				15,000,000		43,672,000	[5]			0		0		11,000,000
Estimated year for completion				FY2015 Q2	[2]			FY2016 Q1		FY2015 Q3	[3]		FY2015 Q3		FY2016 Q1	[4]					FY2016 Q2		FY2015 Q3	[1]		FY2016 Q1				FY2016 Q2		FY2015 Q4	[5]			FY2016 Q2		FY2015 Q2		FY2015 Q4
Interest in joint venture (in hundredths)				52.90%	[2]					86.10%	[3]												58.60%	[1]		55.30%		51.00%	[6]			70.00%	[5]
Insurance proceeds receivable																	4,000,000	[4]
Construction interest capitalized	1,000,000		580,000
Purchase Price of Pending Acquisition						8,500,000	15,000,000					9,300,000																														1,700,000
Value of limited partnership units						100,000	700,000					400,000
Sales price of pending disposition																			2,800,000	4,500,000					7,200,000
Cash paid for acquisition						$ 8,400,000	$ 14,300,000					$ 8,900,000																														$ 1,700,000

[1] The Company is an approximately 58.6% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.

[2] The Company is an approximately 52.9% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.

[3] The Company is an approximately 86.1% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.

[4] On December 5, 2013, this development project was destroyed by fire. As of July 31, 2014, $4.0 million of expected insurance proceeds were included in accounts receivable on the Company’s consolidated balance sheet. See Note 2 for additional information.

[5] The Company is an approximately 70% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.

[6] The Company is currently an approximately 55.3% partner in the joint venture entity constructing this project. The project will be constructed in three phases, and at the conclusion of construction of the third phase, the Company will have an approximately 50.5% interest in the project. The anticipated total cost amount given in the table above is the total cost to the joint venture entity of the project’s first phase. The expected total project cost for all three phases is approximately $69.9 million for a total of approximately 241 residential units and approximately 21,772 square feet of commercial retail space.

[7] Includes costs related to development projects that are placed in service in phases (Renaissance Heights I - $23.0 million).