FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Apr. 30, 2018
FINANCIAL LIABILITIES
Mortgages payable	$ 447,549	$ 509,919
Carrying Amount [Member]
FINANCIAL ASSETS
Cash and cash equivalents	12,777	11,891
FINANCIAL LIABILITIES
Revolving line of credit	69,500	124,000
Mortgages payable	449,414	509,919
Fair Value [Member]
FINANCIAL ASSETS
Cash and cash equivalents	12,777	11,891
FINANCIAL LIABILITIES
Revolving line of credit	69,500	124,000
Mortgages payable	446,360	510,803
Nonrecurring [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate investments		52,145
Nonrecurring [Member] | Level 1 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate investments		0
Nonrecurring [Member] | Level 2 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate investments		0
Nonrecurring [Member] | Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate investments		52,145
Term Loan A [Member] | Carrying Amount [Member]
FINANCIAL LIABILITIES
Term loan	70,000	70,000
Term Loan A [Member] | Fair Value [Member]
FINANCIAL LIABILITIES
Term loan	70,000	70,000
Term Loan B [Member] | Carrying Amount [Member]
FINANCIAL LIABILITIES
Term loan	75,000	0
Term Loan B [Member] | Fair Value [Member]
FINANCIAL LIABILITIES
Term loan	$ 75,000	$ 0