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Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Apr. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 128,558	$ 117,638
Depreciation and amortization	15,197	14,709
Operating income (loss)	9,737	5,807
Total assets	674,744		663,119
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	128,558	117,638
Depreciation and amortization	15,197	14,709
Operating income (loss)	9,737	5,807
Total assets	674,744	643,274
Operating Segments [Member] | Eastern Region [Member]
Segment Reporting Information [Line Items]
Revenues	38,621	33,807
Depreciation and amortization	6,381	6,537
Operating income (loss)	1,626	(577)
Total assets	205,410	168,621
Operating Segments [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Revenues	57,347	52,553
Depreciation and amortization	7,233	6,421
Operating income (loss)	6,896	6,245
Total assets	346,986	347,735
Operating Segments [Member] | Recycling [Member]
Segment Reporting Information [Line Items]
Revenues	11,184	11,162
Depreciation and amortization	1,065	1,097
Operating income (loss)	(44)
Total assets	50,857	54,085
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues	21,406	20,116
Depreciation and amortization	518	654
Operating income (loss)	1,259	139
Total assets	71,491	72,833
Inter-Company Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	(30,199)	(26,109)
Inter-Company Revenue [Member] | Eastern Region [Member]
Segment Reporting Information [Line Items]
Revenues	10,431	8,135
Inter-Company Revenue [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Revenues	19,261	16,758
Inter-Company Revenue [Member] | Recycling [Member]
Segment Reporting Information [Line Items]
Revenues	(5)	1
Inter-Company Revenue [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues	$ 512	$ 1,215

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

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X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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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

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