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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2013 | Jul. 31, 2013 | Oct. 31, 2012 | Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2009 | Jan. 31, 2009 | Oct. 31, 2013 | Oct. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Revenues | $ 132,296 |  | $ 116,836 |  |  |  |  | $ 260,854 | $ 234,474
Operating expenses: |  |  |  |  |  |  |  |  |
Cost of operations | 90,545 |  | 82,087 |  |  |  |  | 178,962 | 163,432
General and administration | 16,425 |  | 13,883 |  |  |  |  | 31,503 | 29,073
Depreciation and amortization | 15,669 |  | 14,570 |  |  |  |  | 30,866 | 29,279
Environmental remediation charge | 150 |  |  | 549 | 335 | 1,532 | 2,823 | 150 |
Severance and reorganization costs | 53 |  | 1,793 |  |  |  |  | 161 | 1,827
Expense from divestiture, acquisition and financing costs | 4 |  | 77 |  |  |  |  | 24 | 631
Total operating expenses | 122,846 |  | 112,410 |  |  |  |  | 241,666 | 224,242
Operating income (loss) | 9,450 |  | 4,426 |  |  |  |  | 19,188 | 10,232
Other expense (income), net: |  |  |  |  |  |  |  |  |
Interest income | (101) |  | (10) |  |  |  |  | (113) | (18)
Interest expense | 9,635 |  | 11,516 |  |  |  |  | 18,994 | 23,207
(Income) loss from equity method investments | (91) |  | 109 |  |  |  |  | 887 | 1,875
(Gain) loss on derivative instruments | 629 |  | 3,896 |  |  |  |  | (25) | 3,896
Loss on debt extinguishment |  |  | 9,670 |  |  |  |  |  | 9,670
Other income | (392) |  | (311) |  |  |  |  | (530) | (441)
Other expense, net | 9,680 |  | 24,870 |  |  |  |  | 19,213 | 38,189
Income (loss) from continuing operations before income taxes | (230) |  | (20,444) |  |  |  |  | (25) | (27,957)
Provision (benefit) for income taxes | 300 |  | 413 |  |  |  |  | 619 | 1,063
Income (loss) from continuing operations | (530) |  | (20,857) |  |  |  |  | (644) | (29,020)
Discontinued operations: |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net | (45) |  | (235) |  |  |  |  | 284 | (451)
Gain (loss) on disposal of discontinued operations, net |  | (378) |  |  |  |  |  | (378) |
Net income (loss) | (575) |  | (21,092) |  |  |  |  | (738) | (29,471)
Less: Net income (loss) attributable to noncontrolling interests | (236) |  | (125) |  |  |  |  | (207) | (133)
Net income (loss) attributable to common stockholders | (339) |  | (20,967) |  |  |  |  | (531) | (29,338)
Parent [Member] |  |  |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |
Cost of operations |  |  | (36) |  |  |  |  | 1 | (8)
General and administration | 595 |  | 157 |  |  |  |  | 748 | 4
Depreciation and amortization | 225 |  | 269 |  |  |  |  | 437 | 533
Severance and reorganization costs |  |  | 917 |  |  |  |  | 4 | 917
Expense from divestiture, acquisition and financing costs |  |  |  |  |  |  |  |  | 303
Total operating expenses | 820 |  | 1,307 |  |  |  |  | 1,190 | 1,749
Operating income (loss) | (820) |  | (1,307) |  |  |  |  | (1,190) | (1,749)
Other expense (income), net: |  |  |  |  |  |  |  |  |
Interest income | (1) |  | (8,176) |  |  |  |  | (1) | (16,239)
Interest expense | 9,616 |  | 11,790 |  |  |  |  | 18,963 | 23,578
(Income) loss from equity method investments | (10,757) |  | 2,275 |  |  |  |  | (19,928) | 5,841
(Gain) loss on derivative instruments | 629 |  | 3,896 |  |  |  |  | (25) | 3,896
Loss on debt extinguishment |  |  | 9,670 |  |  |  |  |  | 9,670
Other income | (268) |  | (208) |  |  |  |  | (287) | (220)
Other expense, net | (781) |  | 19,247 |  |  |  |  | (1,278) | 26,526
Income (loss) from continuing operations before income taxes | (39) |  | (20,554) |  |  |  |  | (88) | (28,275)
Provision (benefit) for income taxes | 300 |  | 413 |  |  |  |  | 619 | 1,063
Income (loss) from continuing operations | (339) |  | (20,967) |  |  |  |  | (531) | (29,338)
Discontinued operations: |  |  |  |  |  |  |  |  |
Net income (loss) | (339) |  | (20,967) |  |  |  |  | (531) | (29,338)
Net income (loss) attributable to common stockholders | (339) |  | (20,967) |  |  |  |  | (531) | (29,338)
Guarantors [Member] |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 131,729 |  | 116,401 |  |  |  |  | 259,423 | 234,029
Operating expenses: |  |  |  |  |  |  |  |  |
Cost of operations | 89,740 |  | 81,507 |  |  |  |  | 177,519 | 162,815
General and administration | 15,779 |  | 13,714 |  |  |  |  | 30,712 | 29,038
Depreciation and amortization | 15,251 |  | 14,240 |  |  |  |  | 30,055 | 28,685
Environmental remediation charge | 150 |  |  |  |  |  |  | 150 |
Severance and reorganization costs | 53 |  | 876 |  |  |  |  | 157 | 910
Expense from divestiture, acquisition and financing costs | 4 |  | 77 |  |  |  |  | 24 | 328
Total operating expenses | 120,977 |  | 110,414 |  |  |  |  | 238,617 | 221,776
Operating income (loss) | 10,752 |  | 5,987 |  |  |  |  | 20,806 | 12,253
Other expense (income), net: |  |  |  |  |  |  |  |  |
Interest income | (100) |  | (9) |  |  |  |  | (112) | (16)
Interest expense | 19 |  | 7,901 |  |  |  |  | 31 | 15,866
(Income) loss from equity method investments | (15) |  | (39) |  |  |  |  | (35) | (58)
Other income | (124) |  | (103) |  |  |  |  | (242) | (221)
Other expense, net | (220) |  | 7,750 |  |  |  |  | (358) | 15,571
Income (loss) from continuing operations before income taxes | 10,972 |  | (1,763) |  |  |  |  | 21,164 | (3,318)
Income (loss) from continuing operations | 10,972 |  | (1,763) |  |  |  |  | 21,164 | (3,318)
Discontinued operations: |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net | (45) |  | (235) |  |  |  |  | 284 | (451)
Gain (loss) on disposal of discontinued operations, net |  |  |  |  |  |  |  | (378) |
Net income (loss) | 10,927 |  | (1,998) |  |  |  |  | 21,070 | (3,769)
Net income (loss) attributable to common stockholders | 10,927 |  | (1,998) |  |  |  |  | 21,070 | (3,769)
Non-Guarantors [Member] |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 567 |  | 435 |  |  |  |  | 1,431 | 445
Operating expenses: |  |  |  |  |  |  |  |  |
Cost of operations | 805 |  | 616 |  |  |  |  | 1,442 | 625
General and administration | 51 |  | 12 |  |  |  |  | 43 | 31
Depreciation and amortization | 193 |  | 61 |  |  |  |  | 374 | 61
Total operating expenses | 1,049 |  | 689 |  |  |  |  | 1,859 | 717
Operating income (loss) | (482) |  | (254) |  |  |  |  | (428) | (272)
Other expense (income), net: |  |  |  |  |  |  |  |  |
(Income) loss from equity method investments | (76) |  | 148 |  |  |  |  | 922 | 1,933
Other income |  |  |  |  |  |  |  | (1) |
Other expense, net | (76) |  | 148 |  |  |  |  | 921 | 1,933
Income (loss) from continuing operations before income taxes | (406) |  | (402) |  |  |  |  | (1,349) | (2,205)
Income (loss) from continuing operations | (406) |  | (402) |  |  |  |  | (1,349) | (2,205)
Discontinued operations: |  |  |  |  |  |  |  |  |
Net income (loss) | (406) |  | (402) |  |  |  |  | (1,349) | (2,205)
Less: Net income (loss) attributable to noncontrolling interests | (236) |  | (125) |  |  |  |  | (207) | (133)
Net income (loss) attributable to common stockholders | (170) |  | (277) |  |  |  |  | (1,142) | (2,072)
Elimination [Member] |  |  |  |  |  |  |  |  |
Other expense (income), net: |  |  |  |  |  |  |  |  |
Interest income |  |  | 8,175 |  |  |  |  |  | 16,237
Interest expense |  |  | (8,175) |  |  |  |  |  | (16,237)
(Income) loss from equity method investments | 10,757 |  | (2,275) |  |  |  |  | 19,928 | (5,841)
Other expense, net | 10,757 |  | (2,275) |  |  |  |  | 19,928 | (5,841)
Income (loss) from continuing operations before income taxes | (10,757) |  | 2,275 |  |  |  |  | (19,928) | 5,841
Income (loss) from continuing operations | (10,757) |  | 2,275 |  |  |  |  | (19,928) | 5,841
Discontinued operations: |  |  |  |  |  |  |  |  |
Net income (loss) | (10,757) |  | 2,275 |  |  |  |  | (19,928) | 5,841
Net income (loss) attributable to common stockholders | $ (10,757) |  | $ 2,275 |  |  |  |  | $ (19,928) | $ 5,841

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