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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Revenues $ 497,633 $ 455,335 $ 467,950
Operating expenses:      
Cost of operations 354,592 323,014 318,068
General and administration 61,865 58,205 60,264
Depreciation and amortization 60,339 56,576 58,415
Asset impairment charge 7,455   40,746
Development project charge 1,394   131
Severance and reorganization costs 586 3,709  
Environmental remediation charge 400    
Expense from divestiture, acquisition and financing costs 144 1,410  
Gain on settlement of acquisition related contingent consideration (1,058)    
Legal settlement     1,359
Total operating expenses 485,717 442,914 478,983
Operating income (loss) 11,916 12,421 (11,033)
Other expense (income):      
Interest income (312) (141) (42)
Interest expense 38,175 41,570 45,008
Loss from equity method investments 936 4,441 9,994
Gain on sale of equity method investment (593)    
Impairment of equity method investment     10,680
Loss on derivative instruments 280 4,512  
Loss on debt extinguishment   15,584 300
Other income (1,059) (1,036) (863)
Other expense, net 37,427 64,930 65,077
Loss from continuing operations before income taxes and discontinued operations (25,511) (52,509) (76,110)
Provision (benefit) for income taxes 1,799 (2,526) 1,593
Loss from continuing operations before discontinued operations (27,310) (49,983) (77,703)
Discontinued operations:      
Income (loss) from discontinued operations (net of income tax benefit of $0, $0 and $412) 284 (4,480) (614)
(Loss) gain on disposal of discontinued operations (net of income tax provision of $0, $0 and $489) (378)   725
Net loss (27,404) (54,463) (77,592)
Less: Net loss attributable to noncontrolling interests (4,309) (321) (6)
Net loss attributable to common stockholders (23,095) (54,142) (77,586)
Net loss attributable to common stockholders:      
Continuing operations, net of tax (23,001) (49,662) (77,697)
Discontinued operations, net of tax (94) (4,480) 111
Net loss attributable to common stockholders (23,095) (54,142) (77,586)
Weighted average common shares outstanding:      
Basic and diluted 39,820 34,015 26,749
Basic and diluted earnings per share:      
Continuing operations, net of tax $ (0.58) $ (1.46) $ (2.90)
Discontinued operations, net of tax $ 0.00 $ (0.13) $ 0.00
Net loss per common share $ (0.58) $ (1.59) $ (2.90)
Significant Legal Settlement [Member]
      
Operating expenses:      
Legal settlement     $ 1,359