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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