Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Income Statement [Abstract]
Revenues	$ 128,558	$ 117,638
Operating expenses:
Cost of operations	88,419	81,345
General and administration	15,078	15,190
Depreciation and amortization	15,197	14,709
Expense from divestiture, acquisition and financing costs	20	553
Severance and reorganization costs	107	34
Total operating expenses	118,821	111,831
Operating income	9,737	5,807
Other expense (income):
Interest income	(12)	(8)
Interest expense	9,359	11,692
Loss from equity method investments	977	1,766
Gain on derivative instruments	(654)
Other income	(138)	(130)
Other expense, net	9,532	13,320
Income (loss) from continuing operations before income taxes and discontinued operations	205	(7,513)
Provision for income taxes	319	650
Loss from continuing operations before discontinued operations	(114)	(8,163)
Discontinued operations:
Income (loss) from discontinued operations (net of income tax provision of $0 and $0)	329	(216)
Loss on disposal of discontinued operations (net of income tax provision of $0 and $0)	(378)
Net loss	(163)	(8,379)
Less: Net income (loss) attributable to noncontrolling interests	28	(8)
Net loss attributable to common stockholders	(191)	(8,371)
Amounts attributable to common stockholders:
Loss from continuing operations before discontinued operations	(142)	(8,155)
Income (loss) from discontinued operations, net of tax	329	(216)
Loss on disposal of discontinued operations, net of tax	(378)
Net loss attributable to common stockholders	$ (191)	$ (8,371)
Basic and diluted earnings per share:
Loss from continuing operations before discontinued operations	$ 0.00	$ (0.30)
Income (loss) from discontinued operations, net of tax	$ 0.01	$ (0.01)
Loss on disposal of discontinued operations, net of tax	$ (0.01)	$ 0.00
Net loss per common share	$ 0.00	$ (0.31)
Basic and diluted weighted average common shares outstanding	39,662	26,992