DISCONTINUED OPERATIONS (Details 2) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Cash Flows from Discontinued Operating Activities:
Net income		$ 0	$ 351	$ 0	$ 7,251
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	[1]	707	816	1,453	1,642
Non-cash credits and charges:
Allowance for doubtful accounts				(24)	17
Changes in assets and liabilities:
Accounts payable and accrued expenses				(239)	(644)
Total adjustments				(39)	7,866
Cash Flows from Investing Activities:
Capital expenditures - property, plant and equipment	[1]	$ (189)	(178)	$ (271)	(555)
Discontinued Operations [Member]
Cash Flows from Discontinued Operating Activities:
Net income			$ 351		7,251
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on settlement					(11,155)
Depreciation and amortization					202
Non-cash credits and charges:
Allowance for doubtful accounts					(867)
Changes in assets and liabilities:
Receivables					4,692
Intangible and other assets					111
Accounts payable and accrued expenses					(2,440)
Other					4,043
Total adjustments					(5,414)
Net cash provided by (used in) operating activities					1,837
Cash Flows from Investing Activities:
Capital expenditures - property, plant and equipment					(31)
Net cash used in investing activities					$ (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.