DISCONTINUED OPERATIONS - Reconciliation of Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Apr. 30, 2017
Carrying amounts of major classes of liabilities included as part of discontinued operations [Abstract]
Total liabilities of the disposal groups classified as held for sale on the balance sheet	$ 29,683	$ 30,062
Discontinued Operations, Held-for-sale [Member]
Carrying amounts of major classes of assets included as part of discontinued operations [Abstract]
Property owned and intangible assets, net of accumulated depreciation and amortization	21,332	21,332
Receivable arising from straight-lining of rents	2,202	2,283
Goodwill	14	14
Total major classes of assets of the discontinued operations	23,548	23,629
Other assets included in the disposal group classified as held for sale	14,004	14,079
Total assets of the disposal groups classified as held for sale on the balance sheet	37,552	37,708
Carrying amounts of major classes of liabilities included as part of discontinued operations [Abstract]
Accounts payable and accrued expenses	59	52
Mortgages payable	15,863	16,226
Other	7,900	7,900
Total major classes of liabilities of the discontinued operations	23,822	24,178
Other liabilities included in the disposal group classified as held for sale	5,861	5,884
Total liabilities of the disposal groups classified as held for sale on the balance sheet	$ 29,683	$ 30,062