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Long-Term Debt and Capital Leases - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2013 Write off Deferred Financing Costs [Member] | Apr. 30, 2013 Write off Unamortized Original Issue Discount [Member] | Apr. 30, 2013 Tender Premium and Tender Fees [Member] | Apr. 30, 2013 Class A Common Stock [Member] | Apr. 30, 2013 Vermont Bonds [Member] | Apr. 30, 2014 Vermont Bonds [Member] | Apr. 30, 2014 Maine Bonds [Member] | Apr. 30, 2012 Maine Bonds [Member] | Apr. 30, 2014 Maine Bonds [Member] Variable rate bonds [Member] | Apr. 30, 2014 2011 Revolver [Member] | Apr. 30, 2014 Senior Secured Revolving Credit Facility [Member] | Apr. 30, 2013 Senior Subordinated Notes [Member] | Apr. 30, 2012 Senior Subordinated Notes [Member] | Apr. 30, 2014 Senior Subordinated Notes [Member] | Apr. 30, 2012 Senior Subordinated Notes Due 2013 [Member] | Apr. 30, 2013 Original Discount [Member] | Apr. 30, 2013 New Hampshire Bonds [Member] | Apr. 30, 2013 Second Lien Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 227,500 |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | Apr. 01, 2036 |  | Jan. 01, 2025 |  |  |  | Mar. 18, 2016 |  | Feb. 15, 2019 |  | Feb. 01, 2013 |  | Apr. 01, 2029 |
Additional increase in credit facility |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Debt Covenants, description |  |  |  |  |  |  |  |  |  |  |  |  | These covenants restrict 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 |  |  |  |  |  |  |
Available revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  | 58,922 |  |  |  |  |  |  |
Outstanding irrevocable letters of credit totaling |  |  |  |  |  |  |  |  |  |  |  |  | 34,718 |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 16,000 |  | 21,400 | 21,400 | 3,600 |  |  | 125,000 | 200,000 |  |  |  | 5,500 |
Additional increase in credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |
Net proceeds from the offering sale | 42,184 |  |  |  |  | 42,184 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,863 |  |
Carrying value of bonds |  |  |  |  |  |  |  | 362,400 |  | 25,000 |  | 133,860 |  |  |  | 325,000 |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  | 4.75% |  | 6.25% |  |  |  |  |  |  | 7.75% |  |  |  |
Additional bond issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500 |
Loss on debt extinguishment | (15,584) | (300) | (2,767) | (2,074) | (10,743) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,584)
Fair value of bonds |  |  |  |  |  |  |  | $ 375,974 |  |  |  |  |  |  |  |  |  |  |  |

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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 Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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