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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 | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2010 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 108,694 | $ 112,167 | $ 116,836 | $ 117,638 | $ 106,375 | $ 111,520 | $ 125,989 | $ 124,066 | $ 106,772 | $ 109,076 | $ 119,694 | $ 119,143 | $ 455,335 | $ 467,950 | $ 454,685
Revenues percentage | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% | 100.00%
Collection [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 208,973 | 205,296 | 199,892
Revenues percentage | 45.90% |  |  |  | 43.90% |  |  |  | 44.00% |  |  |  | 45.90% | 43.90% | 44.00%
Disposal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 115,049 | 123,620 | 118,831
Revenues percentage | 25.30% |  |  |  | 26.40% |  |  |  | 26.10% |  |  |  | 25.30% | 26.40% | 26.10%
Power generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 11,354 | 11,894 | 12,831
Revenues percentage | 2.40% |  |  |  | 2.60% |  |  |  | 2.80% |  |  |  | 2.40% | 2.60% | 2.80%
Organics and processing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 45,373 | 40,904 | 39,211
Revenues percentage | 10.00% |  |  |  | 8.70% |  |  |  | 8.60% |  |  |  | 10.00% | 8.70% | 8.60%
Solid waste operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 380,749 | 381,714 | 370,765
Revenues percentage | 83.60% |  |  |  | 81.60% |  |  |  | 81.50% |  |  |  | 83.60% | 81.60% | 81.50%
Customer Resource Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 35,455 | 38,302 | 40,363
Revenues percentage | 7.80% |  |  |  | 8.20% |  |  |  | 8.90% |  |  |  | 7.80% | 8.20% | 8.90%
Recycling [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,131 | $ 47,934 | $ 43,557
Revenues percentage | 8.60% |  |  |  | 10.20% |  |  |  | 9.60% |  |  |  | 8.60% | 10.20% | 9.60%

X
- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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=6880815&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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- Definition The percentage of net product revenue to total net revenue from the sale of goods as of year end. + References No definition available. + Details
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- Details
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