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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 | 6 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 141,341 | $ 132,296 | $ 282,728 | $ 260,854
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 141,341 | 132,296 | 282,728 | 260,854
Operating Segments [Member] | Solid Waste Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 104,452 | 100,798 | 209,354 | 199,128
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Collection [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 60,338 | 58,765 | 120,349 | 116,978
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Disposal [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 39,665 | 37,374 | 79,758 | 72,497
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Power Generation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,867 | 1,980 | 3,806 | 4,022
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Processing [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,582 | 2,679 | 5,441 | 5,631
Operating Segments [Member] | Organics [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 10,139 | 9,474 | 20,801 | 19,350
Operating Segments [Member] | Customer Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 13,489 | 10,518 | 26,840 | 19,686
Operating Segments [Member] | Recycling [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 13,261 | $ 11,506 | $ 25,733 | $ 22,690

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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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