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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

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