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Subsidiary Guarantors (Schedule of Consolidating Statements Of Operations) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2013 | Jan. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | $ 115,002 |  |  | $ 114,578 |  | $ 356,531 | $ 371,637
Operating expenses: |  |  |  |  |  |  |
Cost of operations | 84,168 |  |  | 81,398 |  | 254,417 | 253,248
General and administration | 14,480 |  |  | 13,933 |  | 43,788 | 46,202
Depreciation and amortization | 14,045 |  |  | 14,827 |  | 43,433 | 44,394
Severance and reorganization costs | 1,636 |  |  |  | 1,793 | 3,463 |
Legal settlement |  |  |  |  |  |  | 1,359
Expense from divestiture, acquisition and financing costs | 372 |  |  |  |  | 1,003 |
Development project cost |  |  |  |  |  |  | 131
Loss on divestiture | 353 |  |  |  |  | 353 |
Total operating expenses | 115,054 |  |  | 110,158 |  | 346,457 | 345,334
Operating income (loss) | (52) |  |  | 4,420 |  | 10,074 | 26,303
Other expense (income), net: |  |  |  |  |  |  |
Interest income | (50) |  |  | (20) |  | (68) | (32)
Interest expense | 9,407 |  |  | 11,528 |  | 32,958 | 33,897
Loss (income) from equity method investments | 1,436 |  |  | 6,383 |  | 3,311 | 10,163
Loss (gain) on derivative instruments | (24) |  |  |  |  | 3,871 |
Impairment of equity method investment |  |  |  | 10,680 |  |  | 10,680
Loss on debt extinguishment | 5,914 |  |  |  |  | 15,584 |
Other income | (298) |  |  | (117) |  | (737) | (549)
Other expense, net | 16,385 |  |  | 28,454 |  | 54,919 | 54,159
Income (loss) from continuing operations before income taxes | (16,437) |  |  | (24,034) |  | (44,845) | (27,856)
Provision (benefit) for income taxes | (4,963) |  |  | 601 |  | (3,899) | 1,330
Net income (loss) | (11,474) |  |  | (24,635) |  | (40,946) | (28,461)
Income (loss) from continuing operations | (11,474) |  |  | (24,635) |  | (40,946) | (29,186)
Less: Net income (loss) attributable to noncontrolling interest | (67) |  |  |  |  | (199) |
operations |  |  |  |  |  |  |
Gain on disposal of discontinued operations, net of tax |  | 79 | 646 |  |  |  | 725
Net income (loss) attributable to common stockholders | (11,407) |  |  | (24,635) |  | (40,747) | (28,461)
Parent [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |
Cost of operations | 12 |  |  | 20 |  | 4 | 49
General and administration | 705 |  |  | 8 |  | (60) | 421
Depreciation and amortization | 236 |  |  | 367 |  | 770 | 1,041
Severance and reorganization costs | 81 |  |  |  |  | 1,766 |
Legal settlement |  |  |  |  |  |  | 1,000
Expense from divestiture, acquisition and financing costs |  |  |  |  |  | 303 |
Total operating expenses | 1,034 |  |  | 395 |  | 2,783 | 2,511
Operating income (loss) | (1,034) |  |  | (395) |  | (2,783) | (2,511)
Other expense (income), net: |  |  |  |  |  |  |
Interest income | (8,275) |  |  | (9,798) |  | (24,515) | (29,514)
Interest expense | 9,422 |  |  | 11,523 |  | 33,000 | 33,982
Loss (income) from equity method investments | 8,480 |  |  | 21,940 |  | 14,324 | 20,385
Loss (gain) on derivative instruments | (24) |  |  |  |  | 3,871 |
Loss on debt extinguishment | 5,914 |  |  |  |  | 15,584 |
Other income | (181) |  |  | (26) |  | (401) | (233)
Other expense, net | 15,336 |  |  | 23,639 |  | 41,863 | 24,620
Income (loss) from continuing operations before income taxes | (16,370) |  |  | (24,034) |  | (44,646) | (27,131)
Provision (benefit) for income taxes | (4,963) |  |  | 601 |  | (3,899) | 1,330
Net income (loss) | (11,407) |  |  | (24,635) |  | (40,747) | (28,461)
Income (loss) from continuing operations |  |  |  |  |  |  | (28,461)
operations |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | (11,407) |  |  | (24,635) |  | (40,747) | (28,461)
Guarantors [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | 114,299 |  |  | 114,578 |  | 355,383 | 371,637
Operating expenses: |  |  |  |  |  |  |
Cost of operations | 83,487 |  |  | 81,377 |  | 253,119 | 253,196
General and administration | 13,748 |  |  | 13,924 |  | 43,791 | 45,780
Depreciation and amortization | 13,629 |  |  | 14,460 |  | 42,422 | 43,353
Severance and reorganization costs | 1,555 |  |  |  |  | 1,697 |
Legal settlement |  |  |  |  |  |  | 359
Expense from divestiture, acquisition and financing costs | 372 |  |  |  |  | 700 |
Development project cost |  |  |  |  |  |  | 131
Loss on divestiture | 353 |  |  |  |  | 353 |
Total operating expenses | 113,144 |  |  | 109,761 |  | 342,082 | 342,819
Operating income (loss) | 1,155 |  |  | 4,817 |  | 13,301 | 28,818
Other expense (income), net: |  |  |  |  |  |  |
Interest income | (49) |  |  | (19) |  | (64) | (26)
Interest expense | 8,259 |  |  | 9,802 |  | 24,469 | 29,423
Loss (income) from equity method investments | 43 |  |  | (26) |  | (14) | (27)
Other income | (117) |  |  | (91) |  | (336) | (316)
Other expense, net | 8,136 |  |  | 9,666 |  | 24,055 | 29,054
Income (loss) from continuing operations before income taxes | (6,981) |  |  | (4,849) |  | (10,754) | (236)
Net income (loss) | (6,981) |  |  | (4,849) |  | (10,754) | (489)
Income (loss) from continuing operations |  |  |  |  |  |  | (236)
operations |  |  |  |  |  |  |
Gain on disposal of discontinued operations, net of tax |  |  |  |  |  |  | 725
Net income (loss) attributable to common stockholders | (6,981) |  |  | (4,849) |  | (10,754) | 489
Non-Guarantors [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | 703 |  |  |  |  | 1,148 |
Operating expenses: |  |  |  |  |  |  |
Cost of operations | 669 |  |  | 1 |  | 1,294 | 3
General and administration | 27 |  |  | 1 |  | 57 | 1
Depreciation and amortization | 180 |  |  |  |  | 241 |
Expense from divestiture, acquisition and financing costs |  |  |  |  |  |  |
Total operating expenses | 876 |  |  | 2 |  | 1,592 | 4
Operating income (loss) | (173) |  |  | (2) |  | (444) | (4)
Other expense (income), net: |  |  |  |  |  |  |
Loss (income) from equity method investments | 1,393 |  |  | 6,409 |  | 3,325 | 10,190
Impairment of equity method investment |  |  |  | 10,680 |  |  | 10,680
Other expense, net | 1,393 |  |  | 17,089 |  | 3,325 | 20,870
Income (loss) from continuing operations before income taxes | (1,566) |  |  | (17,091) |  | (3,769) | (20,874)
Net income (loss) | (1,566) |  |  | (17,091) |  | (3,769) | (20,874)
Income (loss) from continuing operations |  |  |  |  |  |  | (20,874)
Less: Net income (loss) attributable to noncontrolling interest | (67) |  |  |  |  | (199) |
operations |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | (1,499) |  |  | (17,091) |  | (3,570) | (20,874)
Elimination [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |
Expense from divestiture, acquisition and financing costs |  |  |  |  |  |  |
Other expense (income), net: |  |  |  |  |  |  |
Interest income | 8,274 |  |  | 9,797 |  | 24,511 | 29,508
Interest expense | (8,274) |  |  | (9,797) |  | (24,511) | (29,508)
Loss (income) from equity method investments | (8,480) |  |  | (21,940) |  | (14,324) | (20,385)
Other expense, net | (8,480) |  |  | (21,940) |  | (14,324) | (20,385)
Income (loss) from continuing operations before income taxes | 8,480 |  |  | 21,940 |  | 14,324 | 20,385
Net income (loss) | 8,480 |  |  | 21,940 |  | 14,324 | 20,385
Income (loss) from continuing operations |  |  |  |  |  |  | 20,385
operations |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | $ 8,480 |  |  | $ 21,940 |  | $ 14,324 | $ 20,385

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