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Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Segment Reporting Information [Line Items]                              
Revenue $ 118,927 $ 117,852 $ 132,296 $ 128,558 $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 106,375 $ 111,520 $ 125,989 $ 124,066 $ 497,633 $ 455,335 $ 467,950
Depreciation and amortization                         60,339 56,576 58,415
Operating income (loss) (5,973) (1,298) 9,450 9,737 2,110 78 4,426 5,807 (37,679) 4,448 11,730 10,468 11,916 12,421 (11,033)
Interest expense (net)                         37,863 41,429 44,966
Capital expenditures                         45,959 55,027 58,363
Goodwill 119,139       115,928       101,706       119,139 115,928 101,706
Total assets 649,897       663,119       633,743       649,897 663,119 633,743
Recycling [Member]
                              
Segment Reporting Information [Line Items]                              
Goodwill 12,315       12,190       12,190       12,315 12,190 12,190
Operating Segments [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         497,633 455,335 467,950
Operating Segments [Member] | Recycling [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         43,825 42,273 52,195
Depreciation and amortization                         4,262 4,303 4,130
Operating income (loss)                         (2,435) (697) 5,088
Interest expense (net)                           5,553 6,795
Capital expenditures                         1,111 935 5,494
Goodwill 12,315       12,190       12,190       12,315 12,190 12,190
Total assets 49,652       50,921       55,434       49,652 50,921 55,434
Operating Segments [Member] | Other [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         89,567 77,426 75,598
Depreciation and amortization                         2,423 2,309 2,938
Operating income (loss)                         2,158 (1,649) (2,196)
Interest expense (net)                         38,023 10,133 6,454
Capital expenditures                         4,507 3,325 5,668
Goodwill 1,729                       1,729    
Total assets 68,706       65,033       77,990       68,706 65,033 77,990
Operating Segments [Member] | Eastern [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         147,330 129,889 127,930
Depreciation and amortization                         24,961 23,518 25,179
Operating income (loss)                         (1,105) (5,291) (43,640)
Interest expense (net)                         (272) 27,054 31,637
Capital expenditures                         19,870 20,383 19,734
Goodwill 17,429       16,858       58       17,429 16,858 58
Total assets 200,235       198,710       166,938       200,235 198,710 166,938
Operating Segments [Member] | Western [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         216,911 205,747 212,227
Depreciation and amortization                         28,693 26,446 26,168
Operating income (loss)                         13,298 20,058 29,715
Interest expense (net)                         112 (1,311) 80
Capital expenditures                         20,471 30,384 27,467
Goodwill 87,666       86,880       89,458       87,666 86,880 89,458
Total assets 331,304       348,455       333,381       331,304 348,455 333,381
Inter-Company Revenue [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                                
Inter-Company Revenue [Member] | Recycling [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         (139) 116 57
Inter-Company Revenue [Member] | Other [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         2,019 3,933 4,466
Inter-Company Revenue [Member] | Eliminations [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         (111,635) (100,372) (105,858)
Inter-Company Revenue [Member] | Eastern [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         38,946 30,933 33,559
Inter-Company Revenue [Member] | Western [Member]
                              
Segment Reporting Information [Line Items]                              
Revenue                         $ 70,809 $ 65,390 $ 67,776