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Segment Reporting - Summary of Revenue Attributable to Services Provided by Company (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012
Segment Reporting Information [Line Items] |  |
Revenues | $ 128,558 | $ 117,638
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 128,558 | 117,638
Operating Segments [Member] | Solid Waste Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 98,328 | 88,098
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Collection [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 58,313 | 53,033
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Disposal [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 35,123 | 30,967
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Power Generation [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 2,041 | 2,663
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Processing [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 2,851 | 1,435
Operating Segments [Member] | Organics [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 9,877 | 8,853
Operating Segments [Member] | Customer Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 9,169 | 9,525
Operating Segments [Member] | Recycling [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ 11,184 | $ 11,162

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Details
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