ACCOUNTS PAYABLE AND ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	$ 10,284	$ 12,439
Real Estate Operations and Corporate [Member]
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	1,374	1,747
Fulfillment Services [Member]
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	$ 8,910	$ 10,692

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(1),(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant