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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, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Revenues | $ 141,341 | $ 132,296 |  | $ 282,728 | $ 260,854
Operating expenses: |  |  |  |  |
Cost of operations | 98,292 | 90,545 |  | 197,057 | 178,962
General and administration | 16,582 | 16,429 |  | 33,422 | 31,527
Depreciation and amortization | 16,028 | 15,669 |  | 32,396 | 30,866
Environmental remediation charge | 375 | 150 |  | 450 | 150
Severance and reorganization costs |  | 53 |  |  | 161
Total operating expenses | 131,277 | 122,846 |  | 263,325 | 241,666
Operating income (loss) | 10,064 | 9,450 |  | 19,403 | 19,188
Other expense (income), net: |  |  |  |  |
Interest income | (81) | (101) |  | (168) | (113)
Interest expense | 9,623 | 9,635 |  | 19,173 | 18,994
(Income) loss from equity method investments |  | (91) |  |  | 887
Earnings from consolidated entities |  |  |  |  |
(Gain) loss on derivative instruments | 362 | 629 |  | 293 | (25)
Other income | (423) | (392) |  | (614) | (530)
Other expense, net | 9,481 | 9,680 |  | 18,684 | 19,213
Income (loss) from continuing operations before income taxes | 583 | (230) |  | 719 | (25)
Provision (benefit) for income taxes | 222 | 300 |  | 512 | 619
Income (loss) from continuing operations | 361 | (530) |  | 207 | (644)
Discontinued operations: |  |  |  |  |
Income (loss) from discontinued operations, net |  | (45) |  |  | 284
Gain (loss) on disposal of discontinued operations, net |  |  | (378) |  | (378)
Net income (loss) | 361 | (575) |  | 207 | (738)
Less: Net income (loss) attributable to noncontrolling interests | 102 | (236) |  | 238 | (207)
Net income (loss) attributable to common stockholders | 259 | (339) |  | (31) | (531)
Parent [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Revenues |  |  |  |  |
Operating expenses: |  |  |  |  |
Cost of operations | 18 |  |  | 35 | 1
General and administration | 617 | 595 |  | 997 | 748
Depreciation and amortization | 188 | 225 |  | 382 | 437
Environmental remediation charge |  |  |  |  |
Severance and reorganization costs |  |  |  |  | 4
Total operating expenses | 823 | 820 |  | 1,414 | 1,190
Operating income (loss) | (823) | (820) |  | (1,414) | (1,190)
Other expense (income), net: |  |  |  |  |
Interest income |  | (1) |  |  | (1)
Interest expense | 9,710 | 9,616 |  | 19,300 | 18,963
(Income) loss from equity method investments |  | (10,757) |  |  | (19,928)
Earnings from consolidated entities | (11,111) |  |  | (21,198) |
(Gain) loss on derivative instruments | 362 | 629 |  | 293 | (25)
Other income | (265) | (268) |  | (290) | (287)
Other expense, net | (1,304) | (781) |  | (1,895) | (1,278)
Income (loss) from continuing operations before income taxes | 481 | (39) |  | 481 | 88
Provision (benefit) for income taxes | 222 | 300 |  | 512 | 619
Income (loss) from continuing operations |  | (339) |  |  | (531)
Discontinued operations: |  |  |  |  |
Income (loss) from discontinued operations, net |  |  |  |  |
Gain (loss) on disposal of discontinued operations, net |  |  |  |  |
Net income (loss) | 259 | (339) |  | (31) | (531)
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |
Net income (loss) attributable to common stockholders | 259 | (339) |  | (31) | (531)
Guarantor [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Revenues | 141,040 | 131,729 |  | 282,130 | 259,423
Operating expenses: |  |  |  |  |
Cost of operations | 98,186 | 89,740 |  | 196,903 | 177,519
General and administration | 15,961 | 15,783 |  | 32,431 | 30,736
Depreciation and amortization | 15,840 | 15,251 |  | 32,014 | 30,055
Environmental remediation charge | 375 | 150 |  | 450 | 150
Severance and reorganization costs |  | 53 |  |  | 157
Total operating expenses | 130,362 | 120,977 |  | 261,798 | 238,617
Operating income (loss) | 10,678 | 10,752 |  | 20,332 | 20,806
Other expense (income), net: |  |  |  |  |
Interest income | (81) | (100) |  | (168) | (112)
Interest expense | (87) | 19 |  | (127) | 31
(Income) loss from equity method investments |  | (15) |  |  | (35)
Earnings from consolidated entities |  |  |  |  |
(Gain) loss on derivative instruments |  |  |  |  |
Other income | (158) | (124) |  | (324) | (242)
Other expense, net | (326) | (220) |  | (619) | (358)
Income (loss) from continuing operations before income taxes | 11,004 | 10,972 |  | 20,951 | 21,164
Provision (benefit) for income taxes |  |  |  |  |
Income (loss) from continuing operations |  | 10,972 |  |  | 21,164
Discontinued operations: |  |  |  |  |
Income (loss) from discontinued operations, net |  | (45) |  |  | 284
Gain (loss) on disposal of discontinued operations, net |  |  |  |  | (378)
Net income (loss) | 11,004 | 10,927 |  | 20,951 | 21,070
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |
Net income (loss) attributable to common stockholders | 11,004 | 10,927 |  | 20,951 | 21,070
Non-Guarantor [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Revenues | 301 | 567 |  | 598 | 1,431
Operating expenses: |  |  |  |  |
Cost of operations | 88 | 805 |  | 119 | 1,442
General and administration | 4 | 51 |  | (6) | 43
Depreciation and amortization |  | 193 |  |  | 374
Environmental remediation charge |  |  |  |  |
Severance and reorganization costs |  |  |  |  |
Total operating expenses | 92 | 1,049 |  | 113 | 1,859
Operating income (loss) | 209 | (482) |  | 485 | (428)
Other expense (income), net: |  |  |  |  |
Interest income |  |  |  |  |
Interest expense |  |  |  |  |
(Income) loss from equity method investments |  | (76) |  |  | 922
Earnings from consolidated entities |  |  |  |  |
(Gain) loss on derivative instruments |  |  |  |  |
Other income |  |  |  |  | (1)
Other expense, net |  | (76) |  |  | 921
Income (loss) from continuing operations before income taxes | 209 | (406) |  | 485 | (1,349)
Provision (benefit) for income taxes |  |  |  |  |
Income (loss) from continuing operations |  | (406) |  |  | (1,349)
Discontinued operations: |  |  |  |  |
Income (loss) from discontinued operations, net |  |  |  |  |
Gain (loss) on disposal of discontinued operations, net |  |  |  |  |
Net income (loss) | 209 | (406) |  | 485 | (1,349)
Less: Net income (loss) attributable to noncontrolling interests | 102 | (236) |  | 238 | (207)
Net income (loss) attributable to common stockholders | 107 | (170) |  | 247 | (1,142)
Elimination [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Revenues |  |  |  |  |
Operating expenses: |  |  |  |  |
Cost of operations |  |  |  |  |
General and administration |  |  |  |  |
Depreciation and amortization |  |  |  |  |
Environmental remediation charge |  |  |  |  |
Severance and reorganization costs |  |  |  |  |
Total operating expenses |  |  |  |  |
Operating income (loss) |  |  |  |  |
Other expense (income), net: |  |  |  |  |
Interest income |  |  |  |  |
Interest expense |  |  |  |  |
(Income) loss from equity method investments |  | 10,757 |  |  | 19,928
Earnings from consolidated entities | 11,111 |  |  | 21,198 |
(Gain) loss on derivative instruments |  |  |  |  |
Other income |  |  |  |  |
Other expense, net | 11,111 | 10,757 |  | 21,198 | 19,928
Income (loss) from continuing operations before income taxes | (11,111) | (10,757) |  | (21,198) | (19,928)
Provision (benefit) for income taxes |  |  |  |  |
Income (loss) from continuing operations |  | (10,757) |  |  | (19,928)
Discontinued operations: |  |  |  |  |
Income (loss) from discontinued operations, net |  |  |  |  |
Gain (loss) on disposal of discontinued operations, net |  |  |  |  |
Net income (loss) | (11,111) | (10,757) |  | (21,198) | (19,928)
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |
Net income (loss) attributable to common stockholders | $ (11,111) | $ (10,757) |  | $ (21,198) | $ (19,928)

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