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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, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 117,852	$ 112,167	$ 378,706	$ 346,641
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	117,852	112,167	378,706	346,641
Operating Segments [Member] | Solid Waste Operations [Member]
Segment Reporting Information [Line Items]
Revenues	87,780	84,189	286,906	261,699
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Collection [Member]
Segment Reporting Information [Line Items]
Revenues	54,276	51,459	171,520	157,124
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Disposal [Member]
Segment Reporting Information [Line Items]
Revenues	28,907	27,219	101,404	90,569
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Power Generation [Member]
Segment Reporting Information [Line Items]
Revenues	2,791	3,400	6,813	8,856
Operating Segments [Member] | Solid Waste Operations [Member] | Reportable Subsegments [Member] | Processing [Member]
Segment Reporting Information [Line Items]
Revenues	1,806	2,111	7,169	5,150
Operating Segments [Member] | Organics [Member]
Segment Reporting Information [Line Items]
Revenues	8,777	8,725	28,128	25,972
Operating Segments [Member] | Customer Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	11,135	8,551	30,822	27,296
Operating Segments [Member] | Recycling [Member]
Segment Reporting Information [Line Items]
Revenues	$ 10,160	$ 10,702	$ 32,850	$ 31,674

X

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
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