IMPAIRMENT OF ASSETS: (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Indefinite-lived Intangible Assets [Line Items]
Impairment of assets	$ 10,406,000	$ 2,580,000
Original Value Of Impaired Real Estate	23,757,000	5,296,000
Fair Value Of Impaired Real Estate	21,264,000	3,515,000
Impairment of Long-Lived Assets Held-for-use	3,094,000
Impairment of Intangible Assets, Finite-lived	4,806,000
Land and Building [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use	2,970,000
Furniture and Fixtures [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use	124,000
Customer contracts and relationships asset [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	4,806,000
Fulfillment Services [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of assets	7,900,000	771,000
Real Estate [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Real Estate	$ 2,506,000	$ 1,809,000