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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

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