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DEBT - Narrative (Details) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Apr. 30, 2018 USD ($) property loan extension | Apr. 30, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |
Number of real estate properties, owned | property |  | 99 |
Number of real estate properties, serving as collateral for mortgage loans | property |  | 58 |
Property owned |  | $ 1,669,764,000 | $ 1,358,529,000
Number of real estate properties, unemcumbered by mortgages | property |  | 41 |
Number of real estate properties, unemcumbered used to provide credit support | property |  | 30 |
Amount available |  | $ 6,000,000.0 |
Revolving line of credit |  | 124,000,000 | 57,050,000
Carrying principal value |  | 706,140,000 | $ 786,030,000
Domestic Line of Credit [Member] | Minimum [Member] | Base Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread (as a percent) | 0.60% |  |
Domestic Line of Credit [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread (as a percent) | 1.60% |  |
Domestic Line of Credit [Member] | Maximum [Member] | Base Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread (as a percent) | 1.25% |  |
Domestic Line of Credit [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread (as a percent) | 2.25% |  |
Multifamily [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Property owned |  | $ 512,100,000 |
Mortgages [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of loans in default | loan |  | 0 |
Weighted average interest rate (in hundredths) |  | 4.69% | 4.71%
Mortgages [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate |  | 3.47% |
Mortgages [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate |  | 6.66% |
Line of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Amount available |  | $ 300,000,000 | $ 250,000,000
Accordion option |  | $ 200,000,000 |
Term |  | 1 year |
Unsecured Debt [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Original principal balance |  | $ 70,000,000 |
Construction Debt [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Carrying principal value |  |  | $ 41,700,000
Weighted average interest rate (in hundredths) |  |  | 3.27%
BMO Line of Credit [Member] | Line of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Amount available |  | 300,000,000.0 | $ 206,000,000
Revolving line of credit |  | $ 124,000,000 | $ 57,100,000
Interest rate (in hundredths) |  | 3.66% |
Number of extensions | extension |  | 1 |
Extension term |  | 12 months |
BMO Line of Credit [Member] | Domestic Line of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Remaining borrowing capacity |  | $ 176,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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