DEBT - Narrative (Details)	6 Months Ended
Oct. 31, 2018 USD ($) property extension	Apr. 30, 2018 USD ($)
Line of Credit Facility [Line Items]
Number of real estate properties, unencumbered by mortgages \| property	41
Number of real estate properties, unencumbered used to provide credit support \| property	32
Maximum borrowing capacity	$ 6,000,000
Revolving line of credit	69,500,000	$ 124,000,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Revolving line of credit	0	$ 0
Line of Credit [Member] \| BMO Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	250,000,000
Current borrowing capacity	246,000,000
Remaining borrowing capacity	176,500,000
Revolving line of credit	$ 69,500,000
Line of Credit [Member] \| BMO Line of Credit [Member]
Line of Credit Facility [Line Items]
Number of extensions \| extension	1
Extension term	12 months
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.35%
Minimum [Member] \| Base Rate [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	350.00%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.90%
Maximum [Member] \| Base Rate [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	850.00%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Term	1 year
Unsecured Debt [Member] \| Term Loan Maturing 2024 [Member]
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 70,000,000
Unsecured Debt [Member] \| Term Loan Maturing 2025 [Member]
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 75,000,000.0
Term loan term	7 years

Line Of Credit Facility, Extension Term

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- Definition

Line Of Credit Facility, Number Of Extensions

+ References

No definition available.

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- Definition

Number Of Real Estate Properties, Unencumbered

+ References

No definition available.

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- Definition

Number Of Real Estate Properties, Unencumbered, Used To Provide Credit Support

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ 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
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-SubTopic 10
-Section S99
-Paragraph 1
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-SubTopic 10
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