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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Income Statement [Abstract]        
Revenues $ 141,341 $ 132,296 $ 282,728 $ 260,854
Operating expenses:        
Cost of operations 98,292 90,545 197,057 178,962
General and administration 16,582 16,429 33,422 31,527
Depreciation and amortization 16,028 15,669 32,396 30,866
Environmental remediation charge 375 150 450 150
Severance and reorganization costs   53   161
Total operating expenses 131,277 122,846 263,325 241,666
Operating income 10,064 9,450 19,403 19,188
Other expense (income):        
Interest income (81) (101) (168) (113)
Interest expense 9,623 9,635 19,173 18,994
(Income) loss from equity method investments   (91)   887
Loss (gain) on derivative instruments 362 629 293 (25)
Other income (423) (392) (614) (530)
Other expense, net 9,481 9,680 18,684 19,213
Income (loss) from continuing operations before income taxes and discontinued operations 583 (230) 719 (25)
Provision for income taxes 222 300 512 619
Income (loss) from continuing operations before discontinued operations 361 (530) 207 (644)
Discontinued operations:        
(Loss) income from discontinued operations (net of income tax provision of $0, $0, $0 and $0)   (45)   284
Loss on disposal of discontinued operations (net of income tax provision of $0, $0, $0 and $0)       (378)
Net income (loss) 361 (575) 207 (738)
Less: Net income (loss) attributable to noncontrolling interests 102 (236) 238 (207)
Net income (loss) attributable to common stockholders 259 (339) (31) (531)
Amounts attributable to common stockholders:        
Income (loss) from continuing operations before discontinued operations 259 (294) (31) (437)
(Loss) income from discontinued operations, net of tax   (45)   284
Loss on disposal of discontinued operations, net of tax       (378)
Net income (loss) $ 259 $ (339) $ (31) $ (531)
Basic earnings per share:        
Income (loss) from continuing operations before discontinued operations $ 0.01 $ (0.01) $ 0.00 $ (0.01)
(Loss) income from discontinued operations, net of tax   $ 0.00   $ 0.01
Loss on disposal of discontinued operations, net of tax       $ (0.01)
Net income (loss) per common share $ 0.01 $ (0.01) $ 0.00 $ (0.01)
Weighted average common shares outstanding 40,326 39,821 40,225 39,742
Diluted earnings per share:        
Income (loss) from continuing operations before discontinued operations $ 0.01 $ (0.01) $ 0.00 $ (0.01)
(Loss) income from discontinued operations, net of tax   $ 0.00   $ 0.01
Loss on disposal of discontinued operations, net of tax       $ (0.01)
Net income (loss) per common share $ 0.01 $ (0.01) $ 0.00 $ (0.01)
Weighted average common shares outstanding 40,542 39,821 40,225 39,742