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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