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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Revenues $ 455,335 $ 467,950 $ 454,685
Operating expenses:      
Cost of operations 323,014 318,068 306,014
General and administration 58,205 60,264 63,396
Depreciation and amortization 56,576 58,415 58,121
Severance and reorganization costs 3,709    
Expense from divestiture, acquisition and financing costs 1,410    
Asset impairment charge   40,746 3,654
Legal settlement   1,359  
Development project charge   131  
Environmental remediation charge     549
Bargain purchase gain     (2,975)
Gain on sale of assets     (3,502)
Total operating expenses 442,914 478,983 425,257
Operating income (loss) 12,421 (11,033) 29,428
Other expense (income):      
Interest income (141) (42) (54)
Interest expense 41,570 45,008 45,543
Loss from equity method investments 4,441 9,994 4,096
Impairment of equity method investment   10,680  
Loss on derivative instruments 4,512    
Loss on debt extinguishment 15,584 300 7,390
Other income (1,036) (863) (860)
Other expense, net 64,930 65,077 56,115
Loss from continuing operations before income taxes and discontinued operations (52,509) (76,110) (26,687)
(Benefit) provision for income taxes (2,526) 1,593 (23,723)
Loss from continuing operations before discontinued operations (49,983) (77,703) (2,964)
Discontinued operations:      
Loss from discontinued operations (net of income tax benefit of $0, $412 and $1,294) (4,480) (614) (2,198)
Gain on disposal of discontinued operations (net of income tax provision of $0, $489 and $31,714)   725 43,590
Net (loss) income (54,463) (77,592) 38,428
Less: Net loss attributable to noncontrolling interests (321) (6)  
Net (loss) income attributable to common stockholders (54,142) (77,586) 38,428
Amounts attributable to common stockholders:      
Loss from continuing operations before discontinued operations (49,662) (77,697) (2,964)
Loss from discontinued operations, net of tax (4,480) (614) (2,198)
Gain on disposal of discontinued operations, net of tax   725 43,590
Net (loss) income attributable to common stockholders $ (54,142) $ (77,586) $ 38,428
Weighted average common shares outstanding:      
Basic and diluted 34,015 26,749 26,105
Basic and diluted earnings per share:      
Loss from continuing operations before discontinued operations $ (1.46) $ (2.90) $ (0.12)
Loss from discontinued operations, net of tax $ (0.13) $ (0.02) $ (0.08)
Gain on disposal of discontinued operations, net of tax   $ 0.02 $ 1.67
Net (loss) income per common share $ (1.59) $ (2.90) $ 1.47