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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
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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. + Details
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- Definition Minimum interest coverage ratio based on our senior credit facility. + References No definition available. + Details
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- Definition Maximum debt to EBITDA ratio. + References No definition available. + Details
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- Definition Maximum senior funded debt to adjusted EBITDA ratio. + References No definition available. + Details
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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 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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