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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, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013 | Apr. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 117,852 | $ 112,167 | $ 378,706 | $ 346,641 |
Depreciation and amortization | 14,396 | 13,964 | 45,261 | 43,244 |
Operating income (loss) | (1,298) | 78 | 17,889 | 10,310 |
Total assets | 669,442 | 673,153 | 669,442 | 673,153 | 663,119
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 117,852 | 112,167 | 378,706 | 346,641 |
Operating Segments [Member] | Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 35,132 | 32,311 | 114,059 | 99,165 |
Depreciation and amortization | 5,875 | 5,791 | 18,947 | 18,512 |
Operating income (loss) | (3,122) | (2,783) | 706 | (4,385) |
Total assets | 204,330 | 199,251 | 204,330 | 199,251 |
Operating Segments [Member] | Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 50,745 | 50,274 | 166,315 | 157,212 |
Depreciation and amortization | 6,828 | 6,590 | 21,373 | 19,707 |
Operating income (loss) | 3,315 | 3,937 | 17,422 | 16,975 |
Total assets | 345,677 | 353,418 | 345,677 | 353,418 |
Operating Segments [Member] | Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 10,160 | 10,702 | 32,850 | 31,674 |
Depreciation and amortization | 1,056 | 1,067 | 3,195 | 3,244 |
Operating income (loss) | (1,529) | (120) | (1,724) | (606) |
Total assets | 48,859 | 51,814 | 48,859 | 51,814 |
Operating Segments [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 21,815 | 18,880 | 65,482 | 58,590 |
Depreciation and amortization | 637 | 516 | 1,746 | 1,781 |
Operating income (loss) | 38 | (956) | 1,485 | (1,674) |
Total assets | 70,576 | 68,670 | 70,576 | 68,670 |
Inter-Company Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  |  |  |  |
Inter-Company Revenue [Member] | Eastern Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 9,043 | 7,158 | 29,517 | 23,162 |
Inter-Company Revenue [Member] | Western Region [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 16,829 | 15,954 | 54,983 | 49,901 |
Inter-Company Revenue [Member] | Recycling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (44) | 41 | (76) | 77 |
Inter-Company Revenue [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 463 | 736 | 1,466 | 3,247 |
Inter-Company Revenue [Member] | Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ (26,291) | $ (23,889) | $ (85,890) | $ (76,387) |

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