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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, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | 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, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 118,927 | $ 117,852 | $ 132,296 | $ 128,558 | $ 108,694 | $ 112,167 | $ 116,836 | $ 117,638 | $ 106,375 | $ 111,520 | $ 125,989 | $ 124,066 | $ 497,633 | $ 455,335 | $ 467,950
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 497,633 | 455,335 | 467,950
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Operating Segments [Member] | Solid Waste Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 372,583 | 342,277 | 346,582
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 74.90% | 75.10% | 74.10%
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Collection [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 225,441 | 208,973 | 205,296
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 45.30% | 45.90% | 43.90%
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Disposal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 128,778 | 115,049 | 123,620
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 25.90% | 25.30% | 26.40%
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Power Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 9,512 | 11,354 | 11,894
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 1.90% | 2.40% | 2.60%
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Processing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 8,852 | 6,901 | 5,772
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 1.80% | 1.50% | 1.20%
Operating Segments [Member] | Organics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 37,829 | 35,330 | 30,871
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 7.60% | 7.80% | 6.60%
Operating Segments [Member] | Customer Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 43,396 | 35,455 | 38,302
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 8.70% | 7.80% | 8.20%
Operating Segments [Member] | Recycling [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,825 | $ 42,273 | $ 52,195
Revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  | 8.80% | 9.30% | 11.10%

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