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Segment Reporting (Summary of Financial Information by Reportable Segment) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012 | Apr. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Outside revenues | $ 115,002 |  | $ 114,578 |  | $ 356,531 |  | $ 371,637 |  |
Inter-company revenue |  | [1] |  | [1] |  | [1] |  | [1] |
Depreciation and amortization | 14,045 |  | 14,827 |  | 43,433 |  | 44,394 |  |
Operating income (loss) | (52) |  | 4,420 |  | 10,074 |  | 26,303 |  |
Total assets | 673,153 |  | 674,369 |  | 673,153 |  | 674,369 |  | 633,743
Eastern Region [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Outside revenues | 43,777 |  | 42,208 |  | 134,726 |  | 132,158 |  |
Inter-company revenue | 7,553 | [1] | 7,818 | [1] | 24,087 | [1] | 27,111 | [1] |
Depreciation and amortization | 5,699 |  | 6,272 |  | 18,177 |  | 18,301 |  |
Operating income (loss) | (3,156) |  | (975) |  | (4,299) |  | (87) |  |
Total assets | 206,885 |  | 213,058 |  | 206,885 |  | 213,058 |  |
Western Region [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Outside revenues | 51,165 |  | 50,746 |  | 159,879 |  | 167,154 |  |
Inter-company revenue | 16,729 | [1] | 16,274 | [1] | 52,206 | [1] | 55,395 | [1] |
Depreciation and amortization | 6,989 |  | 6,922 |  | 20,889 |  | 21,652 |  |
Operating income (loss) | 4,268 |  | 5,354 |  | 17,762 |  | 24,175 |  |
Total assets | 362,092 |  | 345,371 |  | 362,092 |  | 345,371 |  |
Recycling [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Outside revenues | 9,904 |  | 10,872 |  | 29,308 |  | 37,595 |  |
Inter-company revenue | (9) | [1] | (75) | [1] | (72) | [1] | (179) | [1] |
Depreciation and amortization | 1,039 |  | 1,074 |  | 3,158 |  | 2,935 |  |
Operating income (loss) | (23) |  | 562 |  | (422) |  | 4,905 |  |
Total assets | 51,700 |  | 56,844 |  | 51,700 |  | 56,844 |  |
Other [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Outside revenues | 10,156 |  | 10,752 |  | 32,618 |  | 34,730 |  |
Inter-company revenue | 34 | [1] | 821 | [1] | 1,300 | [1] | 1,897 | [1] |
Depreciation and amortization | 318 |  | 559 |  | 1,209 |  | 1,506 |  |
Operating income (loss) | (1,141) |  | (521) |  | (2,967) |  | (2,690) |  |
Total assets | 52,476 |  | 59,096 |  | 52,476 |  | 59,096 |  |
Eliminations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Inter-company revenue | $ (24,307) | [1] | $ (24,838) | [1] | $ (77,521) | [1] | $ (84,224) | [1] |
[1] | Inter-company revenues reflect transactions with and between segments that are generally made on a basis intended to reflect the market value of such services.

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