BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Proceeds From Financing Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2013	Apr. 30, 2017
Other Liabilities [Line Items]
Proceeds from sale of property	$ 7.9
Contract for deed	29.0
Sale lease-back recorded in other liabilities	$ 7.9
Financing Liability [Member]
Other Liabilities [Line Items]
Financing liability balance		$ 7.9