BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Reclassifications, Proceeds from Financing Liability and Variable Interest Entity (Details) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Oct. 31, 2016 USD ($) property	Apr. 30, 2016 property	Oct. 31, 2016 USD ($) property	Apr. 30, 2014 USD ($)
Proceeds From Financing Liability [Abstract]
Proceeds from sale of property				$ 7.9
Contract for deed				29.0
Sale lease-back recorded in other liabilities				$ 7.9
Financing liability balance	$ 7.9		$ 7.9
Senior Housing properties [Member] | Discontinued Operations, Held-for-sale [Member]
Reclassifications [Abstract]
Number of real estate properties classified as held for sale in discontinued operations | property		34	26
Senior Housing properties [Member] | Discontinued Operations, Disposed of by Sale [Member]
Reclassifications [Abstract]
Number of real estate properties sold | property	8