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Subsidiary Guarantors - Schedule of Consolidating Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2010
Apr. 30, 2009
Jan. 31, 2009
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Condensed Financial Statements, Captions [Line Items]                                    
Revenues $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 106,375 $ 111,520 $ 125,989 $ 124,066 $ 106,772 $ 109,076 $ 119,694 $ 119,143       $ 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
Asset impairment charge         40,746       3,654               40,746 3,654
Severance and reorganization costs 1,882 1,882 1,793                         3,709    
Legal settlement                                 1,359  
Expense from divestiture, acquisition and financing costs                               1,410    
Environmental remediation charge                 549       335 1,532 2,823     549
Development project charge             131                   131  
Bargain purchase gain                                   (2,975)
Gain on sale of assets                                   (3,502)
Total operating expenses                               442,914 478,983 425,257
Operating income (loss) 2,110 78 4,426 5,807 (37,679) 4,448 11,730 10,468 (2,324) 6,571 12,263 12,918       12,421 (11,033) 29,428
Other expense (income), net:                                    
Interest income                               (141) (42) (54)
Interest expense                               41,570 45,008 45,543
Loss (income) 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
Income (loss) from continuing operations before income taxes                               (52,509) (76,110) (26,687)
Provision (benefit) for income taxes                               (2,526) 1,593 (23,723)
Income (loss) from continuing operations (9,817) (11,146) (20,857) (8,163) (48,991) (24,517) (693) (3,502) 4,368 (6,003) 258 (1,587)       (49,983) (77,703) (2,964)
Discontinued operations                                    
Income (loss) from discontinued operations, net                               (4,480) (614) (2,198)
(Loss) gain on disposal of discontinued operations             79 646 43,718               725 43,590
Net (loss) income                               (54,463) (77,592) 38,428
Less: Net income (loss) attributable to noncontrolling interests                               (321) (6)  
Net (loss) income attributable to common stockholders (13,397) (11,407) (20,967) (8,371) (49,124) (24,635) (765) (3,062) 48,849 (6,365) (1,154) (2,902)       (54,142) (77,586) 38,428
Parent [Member]
                                    
Condensed Financial Statements, Captions [Line Items]                                    
Revenues                                       
Operating expenses:                                    
Cost of operations                               (295) 16 73
General and administration                               220 576 873
Depreciation and amortization                               1,017 1,568 1,590
Asset impairment charge                                      
Severance and reorganization costs                               1,766    
Legal settlement                                 1,000  
Expense from divestiture, acquisition and financing costs                               303    
Environmental remediation charge                                     
Development project charge                                     
Bargain purchase gain                                     
Gain on sale of assets                                     
Total operating expenses                               3,011 3,160 2,536
Operating income (loss)                               (3,011) (3,160) (2,536)
Other expense (income), net:                                    
Interest income                               (32,896) (39,871) (31,748)
Interest expense                               42,405 46,058 86,074
Loss (income) from equity method investments                               24,723 66,832 (78,357)
Impairment of equity method investment                                     
Loss on derivative instruments                               4,512    
Loss on debt extinguishment                               15,584 300 7,276
Other income                               (671) (486) (486)
Other expense, net                               53,657 72,833 (17,241)
Income (loss) from continuing operations before income taxes                               (56,668) (75,993) 14,705
Provision (benefit) for income taxes                               (2,526) 1,593 (23,723)
Income (loss) from continuing operations                               (54,142) (77,586) 38,428
Discontinued operations                                    
Income (loss) from discontinued operations, net                                       
(Loss) gain on disposal of discontinued operations                                      
Net (loss) income                               (54,142) (77,586) 38,428
Less: Net income (loss) attributable to noncontrolling interests                                      
Net (loss) income attributable to common stockholders                               (54,142) (77,586) 38,428
Guarantors [Member]
                                    
Condensed Financial Statements, Captions [Line Items]                                    
Revenues                               453,589 467,950 454,685
Operating expenses:                                    
Cost of operations                               321,382 318,047 305,938
General and administration                               57,898 59,677 62,519
Depreciation and amortization                               55,142 56,850 56,526
Asset impairment charge                                 40,746 3,654
Severance and reorganization costs                               1,943    
Legal settlement                                 359  
Expense from divestiture, acquisition and financing costs                               1,107    
Environmental remediation charge                                   549
Development project charge                                 131  
Bargain purchase gain                                   (2,975)
Gain on sale of assets                                   (3,502)
Total operating expenses                               437,472 475,810 422,709
Operating income (loss)                               16,117 (7,860) 31,976
Other expense (income), net:                                    
Interest income                               (113) (34) (27)
Interest expense                               32,033 38,813 (8,810)
Loss (income) from equity method investments                               36 (7)   
Impairment of equity method investment                                     
Loss on derivative instruments                                     
Loss on debt extinguishment                                     114
Other income                               (365) (377) (374)
Other expense, net                               31,591 38,395 (9,097)
Income (loss) from continuing operations before income taxes                               (15,474) (46,255) 41,073
Provision (benefit) for income taxes                                       
Income (loss) from continuing operations                               (15,474) (46,255) 41,073
Discontinued operations                                    
Income (loss) from discontinued operations, net                               (4,480) (614) (2,198)
(Loss) gain on disposal of discontinued operations                                 725 43,590
Net (loss) income                               (19,954) (46,144) 82,465
Less: Net income (loss) attributable to noncontrolling interests                                      
Net (loss) income attributable to common stockholders                               (19,954) (46,144) 82,465
Non-Guarantors [Member]
                                    
Condensed Financial Statements, Captions [Line Items]                                    
Revenues                               1,746      
Operating expenses:                                    
Cost of operations                               1,927 5 3
General and administration                               87 11 4
Depreciation and amortization                               417 (3) 5
Asset impairment charge                                      
Severance and reorganization costs                                     
Legal settlement                                     
Expense from divestiture, acquisition and financing costs                                     
Environmental remediation charge                                     
Development project charge                                     
Bargain purchase gain                                     
Gain on sale of assets                                     
Total operating expenses                               2,431 13 12
Operating income (loss)                               (685) (13) (12)
Other expense (income), net:                                    
Interest income                                       
Interest expense                                       
Loss (income) from equity method investments                               4,405 10,001 4,096
Impairment of equity method investment                                 10,680  
Loss on derivative instruments                                     
Loss on debt extinguishment                                       
Other income                                       
Other expense, net                               4,405 20,681 4,096
Income (loss) from continuing operations before income taxes                               (5,090)    (4,108)
Provision (benefit) for income taxes                                      
Income (loss) from continuing operations                               (5,090) (20,694) (4,108)
Discontinued operations                                    
Income (loss) from discontinued operations, net                                       
(Loss) gain on disposal of discontinued operations                                      
Net (loss) income                               (5,090) (20,694) (4,108)
Less: Net income (loss) attributable to noncontrolling interests                               (321) (6)  
Net (loss) income attributable to common stockholders                               (4,769) (20,688) (4,108)
Elimination [Member]
                                    
Condensed Financial Statements, Captions [Line Items]                                    
Revenues                                       
Operating expenses:                                    
Cost of operations                                       
General and administration                                       
Depreciation and amortization                                       
Asset impairment charge                                      
Severance and reorganization costs                                     
Legal settlement                                     
Expense from divestiture, acquisition and financing costs                                     
Environmental remediation charge                                     
Development project charge                                     
Bargain purchase gain                                     
Gain on sale of assets                                     
Total operating expenses                                       
Operating income (loss)                                       
Other expense (income), net:                                    
Interest income                               32,868 39,863 31,721
Interest expense                               (32,868) (39,863) (31,721)
Loss (income) from equity method investments                               (24,723) (66,832) 78,357
Impairment of equity method investment                                     
Loss on derivative instruments                                     
Loss on debt extinguishment                                       
Other income                                       
Other expense, net                               (24,723) (66,832) 78,357
Income (loss) from continuing operations before income taxes                               24,723 66,832 (78,357)
Provision (benefit) for income taxes                                       
Income (loss) from continuing operations                               24,723 66,832 (78,357)
Discontinued operations                                    
Income (loss) from discontinued operations, net                                       
(Loss) gain on disposal of discontinued operations                                      
Net (loss) income                               24,723 66,832 (78,357)
Less: Net income (loss) attributable to noncontrolling interests                                      
Net (loss) income attributable to common stockholders                               $ 24,723 $ 66,832 $ (78,357)