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Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Apr. 30, 2013
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 128,558 | $ 117,638 |
Depreciation and amortization | 15,197 | 14,709 |
Operating income (loss) | 9,737 | 5,807 |
Total assets | 674,744 |  | 663,119
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 128,558 | 117,638 |
Depreciation and amortization | 15,197 | 14,709 |
Operating income (loss) | 9,737 | 5,807 |
Total assets | 674,744 | 643,274 |
Operating Segments [Member] | Eastern Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 38,621 | 33,807 |
Depreciation and amortization | 6,381 | 6,537 |
Operating income (loss) | 1,626 | (577) |
Total assets | 205,410 | 168,621 |
Operating Segments [Member] | Western Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 57,347 | 52,553 |
Depreciation and amortization | 7,233 | 6,421 |
Operating income (loss) | 6,896 | 6,245 |
Total assets | 346,986 | 347,735 |
Operating Segments [Member] | Recycling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 11,184 | 11,162 |
Depreciation and amortization | 1,065 | 1,097 |
Operating income (loss) | (44) |  |
Total assets | 50,857 | 54,085 |
Operating Segments [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 21,406 | 20,116 |
Depreciation and amortization | 518 | 654 |
Operating income (loss) | 1,259 | 139 |
Total assets | 71,491 | 72,833 |
Inter-Company Revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (30,199) | (26,109) |
Inter-Company Revenue [Member] | Eastern Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 10,431 | 8,135 |
Inter-Company Revenue [Member] | Western Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 19,261 | 16,758 |
Inter-Company Revenue [Member] | Recycling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (5) | 1 |
Inter-Company Revenue [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 512 | $ 1,215 |

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