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DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Apr. 30, 2018
Debt Instrument [Line Items] |  |
Carrying principal balance | $ 666,555 | $ 706,140
Weighted Average Maturity in Years | 4 years 11 months 3 days |
Fixed Rate Mortgages Payable [Member] |  |
Debt Instrument [Line Items] |  |
Carrying principal balance | $ 466,555 | 489,401
Weighted Average Maturity in Years | 5 years 4 months 24 days |
Variable Rate Mortgages Payable [Member] |  |
Debt Instrument [Line Items] |  |
Carrying principal balance | $ 0 | $ 22,739
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 4.65% | 4.69%
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying principal balance | $ 200,000 | $ 194,000
Unsecured Debt [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Carrying principal balance | $ 130,000 | $ 124,000
Weighted Average Maturity in Years | 3 years |
Weighted average interest rate | 3.83% | 3.35%
Unsecured Debt [Member] | Medium-term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Carrying principal balance | $ 70,000 | $ 70,000
Weighted Average Maturity in Years | 4 years |
Weighted average interest rate | 3.86% | 3.86%

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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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