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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
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, 2014
Apr. 30, 2013
Apr. 30, 2012
Condensed Financial Statements, Captions [Line Items]                              
Revenues $ 118,927 $ 117,852 $ 132,296 $ 128,558 $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 106,375 $ 111,520 $ 125,989 $ 124,066 $ 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
Legal settlement                             1,359
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  
Change in fair value of acquisition related contingent consideration                         (1,058)    
Total operating expenses                         485,717 442,914 478,983
Operating income (loss) (5,973) (1,298) 9,450 9,737 2,110 78 4,426 5,807 (37,679) 4,448 11,730 10,468 11,916 12,421 (11,033)
Other expense (income), net:                              
Interest income                         (312) (141) (42)
Interest expense                         38,175 41,570 45,008
(Income) loss from equity method investments                         936 4,441 9,994
(Gain) loss on sale of equity method investment                         (593)    
Impairment of equity method investment                             10,680
(Gain) 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
Income (loss) from continuing operations before income taxes                         (25,511) (52,509) (76,110)
Provision (benefit) for income taxes                         1,799 (2,526) 1,593
Income (loss) from continuing operations (15,633) (11,033) (530) (114) (9,817) (11,146) (20,857) (8,163) (48,991) (24,517) (693) (3,502) (27,310) (49,983) (77,703)
Discontinued operations:                              
Income (loss) from discontinued operations, net                         284 (4,480) (614)
Gain (loss) on disposal of discontinued operations, net       (378)                 (378)   725
Net income (loss)                         (27,404) (54,463) (77,592)
Less: Net income (loss) attributable to noncontrolling interests                         (4,309) (321) (6)
Net income (loss) attributable to common stockholders (11,815) (10,750) (339) (191) (13,397) (11,407) (20,967) (8,371) (49,124) (24,635) (765) (3,062) (23,095) (54,142) (77,586)
Parent [Member]
                             
Condensed Financial Statements, Captions [Line Items]                              
Revenues                               
Operating expenses:                              
Cost of operations                         (23) (295) 16
General and administration                         1,377 220 576
Depreciation and amortization                         935 1,017 1,568
Asset impairment charge                               
Legal settlement                             1,000
Development project charge                               
Severance and reorganization costs                         4 1,766  
Environmental remediation charge                               
Expense from divestiture, acquisition and financing costs                            303  
Change in fair value of acquisition related contingent consideration                               
Total operating expenses                         2,293 3,011 3,160
Operating income (loss)                         (2,293) (3,011) (3,160)
Other expense (income), net:                              
Interest income                         (4) (32,896) (39,871)
Interest expense                         38,095 42,405 46,058
(Income) loss from equity method investments                         (18,811) 24,723 66,832
(Gain) loss on sale of equity method investment                               
(Gain) loss on derivative instruments                         280 4,512  
Loss on debt extinguishment                           15,584 300
Other income                         (557) (671) (486)
Other expense, net                         19,003 53,657 72,833
Income (loss) from continuing operations before income taxes                         (21,296) (56,668) (75,993)
Provision (benefit) for income taxes                         1,799 (2,526) 1,593
Income (loss) from continuing operations                         (23,095) (54,142) (77,586)
Discontinued operations:                              
Income (loss) from discontinued operations, net                               
Gain (loss) on disposal of discontinued operations, net                               
Net income (loss)                         (23,095) (54,142) (77,586)
Less: Net income (loss) attributable to noncontrolling interests                               
Net income (loss) attributable to common stockholders                         (23,095) (54,142) (77,586)
Guarantors [Member]
                             
Condensed Financial Statements, Captions [Line Items]                              
Revenues                         495,391 453,589 467,950
Operating expenses:                              
Cost of operations                         351,829 321,382 318,047
General and administration                         60,446 57,898 59,677
Depreciation and amortization                         58,651 55,142 56,850
Asset impairment charge                              40,746
Legal settlement                             359
Development project charge                         1,394   131
Severance and reorganization costs                         582 1,943  
Environmental remediation charge                         400    
Expense from divestiture, acquisition and financing costs                         144 1,107  
Change in fair value of acquisition related contingent consideration                         (1,058)    
Total operating expenses                         472,388 437,472 475,810
Operating income (loss)                         23,003 16,117 (7,860)
Other expense (income), net:                              
Interest income                         (308) (113) (34)
Interest expense                         80 32,033 38,813
(Income) loss from equity method investments                         (169) 36 (7)
(Gain) loss on sale of equity method investment                               
(Gain) loss on derivative instruments                               
Other income                         (501) (365) (377)
Other expense, net                         (898) 31,591 38,395
Income (loss) from continuing operations before income taxes                         23,901 (15,474) (46,255)
Provision (benefit) for income taxes                               
Income (loss) from continuing operations                         23,901 (15,474) (46,255)
Discontinued operations:                              
Income (loss) from discontinued operations, net                         284 (4,480) (614)
Gain (loss) on disposal of discontinued operations, net                         (378)   725
Net income (loss)                         23,807 (19,954) (46,144)
Less: Net income (loss) attributable to noncontrolling interests                               
Net income (loss) attributable to common stockholders                         23,807 (19,954) (46,144)
Non-Guarantors [Member]
                             
Condensed Financial Statements, Captions [Line Items]                              
Revenues                         2,242 1,746  
Operating expenses:                              
Cost of operations                         2,786 1,927 5
General and administration                         42 87 11
Depreciation and amortization                         753 417 (3)
Asset impairment charge                         7,455    
Development project charge                               
Severance and reorganization costs                               
Environmental remediation charge                               
Expense from divestiture, acquisition and financing costs                               
Change in fair value of acquisition related contingent consideration                               
Total operating expenses                         11,036 2,431 13
Operating income (loss)                         (8,794) (685) (13)
Other expense (income), net:                              
Interest income                               
Interest expense                               
(Income) loss from equity method investments                         1,105 4,405 10,001
(Gain) loss on sale of equity method investment                         (593)    
Impairment of equity method investment                             10,680
(Gain) loss on derivative instruments                               
Other income                         (1)    
Other expense, net                         511 4,405 20,681
Income (loss) from continuing operations before income taxes                         (9,305) (5,090) (20,694)
Provision (benefit) for income taxes                               
Income (loss) from continuing operations                         (9,305) (5,090) (20,694)
Discontinued operations:                              
Income (loss) from discontinued operations, net                               
Gain (loss) on disposal of discontinued operations, net                               
Net income (loss)                         (9,305) (5,090) (20,694)
Less: Net income (loss) attributable to noncontrolling interests                         (4,309) (321) (6)
Net income (loss) attributable to common stockholders                         (4,996) (4,769) (20,688)
Elimination [Member]
                             
Condensed Financial Statements, Captions [Line Items]                              
Revenues                               
Operating expenses:                              
Cost of operations                               
General and administration                               
Depreciation and amortization                               
Asset impairment charge                               
Development project charge                               
Severance and reorganization costs                               
Environmental remediation charge                               
Expense from divestiture, acquisition and financing costs                               
Change in fair value of acquisition related contingent consideration                               
Total operating expenses                               
Operating income (loss)                               
Other expense (income), net:                              
Interest income                            32,868 39,863
Interest expense                            (32,868) (39,863)
(Income) loss from equity method investments                         18,811 (24,723) (66,832)
(Gain) loss on sale of equity method investment                               
(Gain) loss on derivative instruments                               
Other income                               
Other expense, net                         18,811 (24,723) (66,832)
Income (loss) from continuing operations before income taxes                         (18,811) 24,723 66,832
Provision (benefit) for income taxes                               
Income (loss) from continuing operations                         (18,811) 24,723 66,832
Discontinued operations:                              
Income (loss) from discontinued operations, net                               
Gain (loss) on disposal of discontinued operations, net                               
Net income (loss)                         (18,811) 24,723 66,832
Less: Net income (loss) attributable to noncontrolling interests                               
Net income (loss) attributable to common stockholders                         $ (18,811) $ 24,723 $ 66,832