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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 | 9 Months Ended
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 115,002 | $ 114,578 | $ 356,531 | $ 371,637
Collection [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 51,459 | 48,875 | 157,124 | 157,265
Disposal [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 27,219 | 30,220 | 90,569 | 96,645
Power Generation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,400 | 3,182 | 8,856 | 9,415
Processing And Organics [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 14,469 | 12,231 | 43,378 | 40,961
Solid Waste Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 96,547 | 94,508 | 299,927 | 304,286
Major Accounts [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 8,551 | 9,198 | 27,296 | 29,756
Recycling [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 9,904 | $ 10,872 | $ 29,308 | $ 37,595

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- 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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- Details
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