DISCONTINUED OPERATIONS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Jan. 31, 2015		Jan. 31, 2014		Jan. 31, 2015		Jan. 31, 2014
Cash Flows from Discontinued Operating Activities:
Net income (loss)	$ 33		$ (301)		$ 7,284		$ (63)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain on settlement					(11,155)		0
Depreciation and amortization	792	[1]	834	[1]	2,434	[1]	2,457	[1]
Non-cash credits and charges:
Allowance for doubtful accounts					14		292
Changes in assets and liabilities:
Accounts payable and accrued expenses					(1,903)		96
Total adjustments					12,232		1,062
Cash Flows from Investing Activities:
Capital expenditures - property, plant and equipment	(176)	[1]	(116)	[1]	(731)	[1]	(267)	[1]
Discontinued Operations [Member]
Cash Flows from Discontinued Operating Activities:
Net income (loss)					7,284		(63)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain on settlement					(11,155)		0
Depreciation and amortization					300		319
Non-cash credits and charges:
Allowance for doubtful accounts					(1,483)		196
Changes in assets and liabilities:
Receivables					8,170		12,245
Intangible and other assets					51		(591)
Accounts payable and accrued expenses					(4,543)		(11,834)
Other liabilities					0		(134)
Total adjustments					(8,660)		201
Net cash provided by (used in) operating activities					(1,376)		138
Cash Flows from Investing Activities:
Capital expenditures - property, plant and equipment					(25)		(101)
Proceeds from disposition of assets					0		222
Net cash provided by (used in) investing activities					$ (25)		$ 121

[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.