DISCONTINUED OPERATIONS (Details 2) - USD ($) $ in Thousands		3 Months Ended
		Jul. 31, 2015	Jul. 31, 2014
Cash Flows from Discontinued Operating Activities:
Net income		$ 0	$ 6,900
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	[1]	746	826
Non-cash credits and charges:
Allowance for doubtful accounts		29	(111)
Changes in assets and liabilities:
Accounts payable and accrued expenses		(1,458)	(1,492)
Total adjustments		(2,235)	3,126
Cash Flows from Investing Activities:
Capital expenditures - property, plant and equipment	[1]	(82)	(377)
Discontinued Operations [Member]
Cash Flows from Discontinued Operating Activities:
Net income		0	6,900
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on settlement		0	(11,155)
Depreciation and amortization		0	106
Non-cash credits and charges:
Allowance for doubtful accounts		0	22
Changes in assets and liabilities:
Receivables		431	(3,617)
Intangible and other assets		17	(1,147)
Accounts payable and accrued expenses		(150)	(1,781)
Other assets and liabilities		(145)	4,041
Total adjustments		153	(13,531)
Net cash provided by (used in) operating activities		153	(6,631)
Cash Flows from Investing Activities:
Capital expenditures - property, plant and equipment		0	(31)
Net cash used in investing activities		$ 0	$ (31)

[1] Revenue information provided for each segment includes amounts grouped as Other in the accompanying consolidated statements of operations. Corporate and Other is net of intercompany eliminations.