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Long-Term Debt - Additional Information (Detail) (Senior Secured Revolving Credit Facility [Member])	3 Months Ended
	Jul. 31, 2013
Senior Secured Revolving Credit Facility [Member]
Proforma Debt Instrument [Line Items]
Debt Covenants, description	These covenants restrict fiscal year capital expenditures to 1.1 times our consolidated depreciation expense, depletion expense and landfill amortization expense, set a minimum interest coverage ratio of 2.25, a maximum consolidated total funded debt to consolidated EBITDA ratio of 5.85 and a maximum senior funded debt to consolidated EBITDA ratio of 2.50.
Ratio of restricted capital expenditure	1.1
Coverage ratio	2.25
Consolidated total funded debt to consolidated EBITDA ratio	5.85
Senior funded debt to consolidated EBITDA ratio	2.50

X

- Definition

Maximum annual capital expenditures ratio based on our senior credit facility.

+ References

No definition available.

+ Details

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X

- Definition

Minimum interest coverage ratio based on our senior credit facility.

+ References

No definition available.

+ Details

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X

- Definition

Maximum debt to EBITDA ratio based on our senior credit facility.

+ References

No definition available.

+ Details

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X

- Definition

Maximum senior debt to EBITDA ratio based on our senior credit facility.

+ References

No definition available.

+ Details

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X

- Details

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X

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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