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Subsidiary Guarantors - Schedule of Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | $ 117,852 |  |  | $ 112,167 | $ 378,706 | $ 346,641
Operating expenses: |  |  |  |  |  |
Cost of operations | 87,602 |  |  | 81,436 | 266,565 | 244,867
General and administration | 15,361 |  |  | 14,328 | 46,864 | 43,401
Depreciation and amortization | 14,396 |  |  | 13,964 | 45,261 | 43,244
Development project charge | 1,440 |  |  |  | 1,440 |
Environmental remediation charge | 250 |  |  |  | 400 |
Severance and reorganization costs | 0 | 1,793 |  | 1,636 | 161 | 3,463
Expense from divestiture, acquisition and financing costs | 101 |  |  | 372 | 126 | 1,003
Loss on divestiture |  |  |  | 353 |  | 353
Total operating expenses | 119,150 |  |  | 112,089 | 360,817 | 336,331
Operating income (loss) | (1,298) |  |  | 78 | 17,889 | 10,310
Other expense (income), net: |  |  |  |  |  |
Interest income | (109) |  |  | (50) | (222) | (68)
Interest expense | 9,568 |  |  | 9,209 | 28,562 | 32,415
(Income) loss from equity method investments | 112 |  |  | 1,436 | 998 | 3,311
(Gain) loss on sale of equity method investment | (593) |  |  |  | (593) |
Loss (gain) on derivative instruments | 233 |  |  | (24) | 208 | 3,871
Loss on debt extinguishment |  |  |  | 5,914 |  | 15,584
Other income | (132) |  |  | (298) | (662) | (737)
Other expense, net | 9,079 |  |  | 16,187 | 28,291 | 54,376
Income (loss) from continuing operations before income taxes | (10,377) |  |  | (16,109) | (10,402) | (44,066)
Provision (benefit) for income taxes | 656 |  |  | (4,963) | 1,275 | (3,899)
Income (loss) from continuing operations | (11,033) |  |  | (11,146) | (11,677) | (40,167)
Discontinued operations: |  |  |  |  |  |
Income (loss) from discontinued operations, net |  |  |  | (328) | 284 | (779)
Gain (loss) on disposal of discontinued operations, net |  |  | (378) |  | (378) |
Net income (loss) | (11,033) |  |  | (11,474) | (11,771) | (40,946)
Less: Net income (loss) attributable to noncontrolling interests | (283) |  |  | (67) | (490) | (199)
Net income (loss) attributable to common stockholders | (10,750) |  |  | (11,407) | (11,281) | (40,747)
Parent [Member] |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |
Cost of operations | (26) |  |  | 12 | (25) | 4
General and administration | (15) |  |  | (63) | 733 | (60)
Depreciation and amortization | 262 |  |  | 236 | 700 | 770
Severance and reorganization costs |  |  |  | 849 | 4 | 1,766
Expense from divestiture, acquisition and financing costs |  |  |  |  |  | 303
Total operating expenses | 221 |  |  | 1,034 | 1,412 | 2,783
Operating income (loss) | (221) |  |  | (1,034) | (1,412) | (2,783)
Other expense (income), net: |  |  |  |  |  |
Interest income | (3) |  |  | (8,275) | (3) | (24,515)
Interest expense | 9,576 |  |  | 9,422 | 28,539 | 33,000
(Income) loss from equity method investments | 78 |  |  | 8,480 | (19,852) | 14,324
Loss (gain) on derivative instruments | 233 |  |  | (24) | 208 | 3,871
Loss on debt extinguishment |  |  |  | 5,914 |  | 15,584
Other income | (11) |  |  | (181) | (298) | (401)
Other expense, net | 9,873 |  |  | 15,336 | 8,594 | 41,863
Income (loss) from continuing operations before income taxes | (10,094) |  |  | (16,370) | (10,006) | (44,646)
Provision (benefit) for income taxes | 656 |  |  | (4,963) | 1,275 | (3,899)
Income (loss) from continuing operations |  |  |  | (11,407) | (11,281) | (40,747)
Discontinued operations: |  |  |  |  |  |
Net income (loss) | (10,750) |  |  | (11,407) | (11,281) | (40,747)
Net income (loss) attributable to common stockholders | (10,750) |  |  | (11,407) | (11,281) | (40,747)
Guarantors [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 117,441 |  |  | 111,464 | 376,864 | 345,493
Operating expenses: |  |  |  |  |  |
Cost of operations | 86,791 |  |  | 80,755 | 264,311 | 243,569
General and administration | 15,394 |  |  | 14,364 | 46,107 | 43,404
Depreciation and amortization | 13,953 |  |  | 13,548 | 44,006 | 42,233
Development project charge | 1,440 |  |  |  | 1,440 |
Environmental remediation charge | 250 |  |  |  | 400 |
Severance and reorganization costs |  |  |  | 787 | 157 | 1,697
Expense from divestiture, acquisition and financing costs | 101 |  |  | 372 | 126 | 700
Loss on divestiture |  |  |  | 353 |  | 353
Total operating expenses | 117,929 |  |  | 110,179 | 356,547 | 331,956
Operating income (loss) | (488) |  |  | 1,285 | 20,317 | 13,537
Other expense (income), net: |  |  |  |  |  |
Interest income | (106) |  |  | (49) | (219) | (64)
Interest expense | (8) |  |  | 8,061 | 23 | 23,926
(Income) loss from equity method investments | (71) |  |  | 43 | (107) | (14)
Other income | (121) |  |  | (117) | (363) | (336)
Other expense, net | (306) |  |  | 7,938 | (666) | 23,512
Income (loss) from continuing operations before income taxes | (182) |  |  | (6,653) | 20,983 | (9,975)
Income (loss) from continuing operations |  |  |  | (6,653) | 20,983 | (9,975)
Discontinued operations: |  |  |  |  |  |
Income (loss) from discontinued operations, net |  |  |  | (328) | 284 | (779)
Gain (loss) on disposal of discontinued operations, net |  |  |  |  | (378) |
Net income (loss) | (182) |  |  | (6,981) | 20,889 | (10,754)
Net income (loss) attributable to common stockholders | (182) |  |  | (6,981) | 20,889 | (10,754)
Non-Guarantors [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 411 |  |  | 703 | 1,842 | 1,148
Operating expenses: |  |  |  |  |  |
Cost of operations | 837 |  |  | 669 | 2,279 | 1,294
General and administration | (18) |  |  | 27 | 24 | 57
Depreciation and amortization | 181 |  |  | 180 | 555 | 241
Total operating expenses | 1,000 |  |  | 876 | 2,858 | 1,592
Operating income (loss) | (589) |  |  | (173) | (1,016) | (444)
Other expense (income), net: |  |  |  |  |  |
(Income) loss from equity method investments | 183 |  |  | 1,393 | 1,105 | 3,325
(Gain) loss on sale of equity method investment | (593) |  |  |  | (593) |
Other income |  |  |  |  | (1) |
Other expense, net | (410) |  |  | 1,393 | 511 | 3,325
Income (loss) from continuing operations before income taxes | (179) |  |  | (1,566) | (1,527) | (3,769)
Income (loss) from continuing operations |  |  |  | (1,566) | (1,527) | (3,769)
Discontinued operations: |  |  |  |  |  |
Net income (loss) | (179) |  |  | (1,566) | (1,527) | (3,769)
Less: Net income (loss) attributable to noncontrolling interests | (283) |  |  | (67) | (490) | (199)
Net income (loss) attributable to common stockholders | 104 |  |  | (1,499) | (1,037) | (3,570)
Elimination [Member] |  |  |  |  |  |
Other expense (income), net: |  |  |  |  |  |
Interest income |  |  |  | 8,274 |  | 24,511
Interest expense |  |  |  | (8,274) |  | (24,511)
(Income) loss from equity method investments | (78) |  |  | (8,480) | 19,852 | (14,324)
Other expense, net | (78) |  |  | (8,480) | 19,852 | (14,324)
Income (loss) from continuing operations before income taxes | 78 |  |  | 8,480 | (19,852) | 14,324
Income (loss) from continuing operations |  |  |  | 8,480 | (19,852) | 14,324
Discontinued operations: |  |  |  |  |  |
Net income (loss) | 78 |  |  | 8,480 | (19,852) | 14,324
Net income (loss) attributable to common stockholders | $ 78 |  |  | $ 8,480 | $ (19,852) | $ 14,324

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