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Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended			0 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2013	Jan. 31, 2013 Write off Deferred Financing Costs [Member]	Jan. 31, 2013 Write off Unamortized Original Issue Discount [Member]	Jan. 31, 2013 Tender Premium and Tender Fees [Member]	Jun. 25, 2013 Senior Secured Revolving Credit Facility [Member]	Jan. 31, 2014 Senior Secured Revolving Credit Facility [Member]	Jan. 31, 2013 Second Lien Notes [Member]	Jan. 31, 2014 Second Lien Notes [Member]	Jan. 31, 2013 Second Lien Notes [Member]	Jan. 31, 2013 Second Lien Notes [Member] Write off Deferred Financing Costs [Member]	Jan. 31, 2013 Second Lien Notes [Member] Write off Unamortized Original Issue Discount [Member]	Jan. 31, 2013 Second Lien Notes [Member] Tender Premium and Tender Fees [Member]
Proforma Debt Instrument [Line Items]
Maturity date						Mar. 18, 2016
Debt Covenants, description							These covenants restrict fiscal year capital expenditures to 1.1 times our consolidated depreciation expense, depletion expense and landfill amortization expense, and 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
Loss on debt extinguishments	$ 5,914	$ 15,584						$ 5,914		$ 15,584	$ 2,767	$ 2,074	$ 10,743
Amount of refinancing 11% senior second lien notes due 2014								180,000		180,000
Debt instrument interest rate								11.00%		11.00%
Debt instrument maturity year									2014
Write off of deferred financing costs			1,100
Write off discount				816
Charge associated with the early tender premium					$ 3,998

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- Definition

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

+ References

No definition available.

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- Definition

Debt instrument maturity year.

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- Definition

Gain loss on tender.

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No definition available.

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- Definition

Minimum interest coverage ratio based on our senior credit facility.

+ References

No definition available.

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- Definition

Maximum debt to EBITDA ratio.

+ References

No definition available.

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- Definition

Maximum senior funded debt to adjusted EBITDA ratio.

+ References

No definition available.

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- Definition

Amount of write-off of debt discount in an extinguishment of debt.

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No definition available.

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- 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



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-Topic 942

-SubTopic 470

-Section 50

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Face (par) amount of debt instrument at time of issuance.

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-SubTopic 30

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5



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-Topic 210

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5



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

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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