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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

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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