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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 | 3 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2012 Maine Bonds [Member] | Apr. 30, 2012 Maine Bonds [Member] Remarketed Bond [Member] | Apr. 30, 2012 Maine Bonds [Member] Variable rate bonds [Member] | Apr. 30, 2011 2009 Term Loan [Member] | Apr. 30, 2011 2013 Notes [Member] | Apr. 30, 2013 Vermont Bonds [Member] | Apr. 30, 2013 2011 Revolver [Member] | Apr. 30, 2013 Class A Common Stock [Member] | Apr. 30, 2013 Senior secured revolving credit facility [Member] | Apr. 30, 2013 Senior subordinated notes [Member] | Apr. 30, 2012 Senior subordinated notes [Member] | Apr. 30, 2012 Senior subordinated notes due 2013 [Member] | Apr. 30, 2013 Second Lien Notes [Member] | Jan. 31, 2013 Second Lien Notes [Member] | Oct. 31, 2011 Second Lien Notes [Member] | Apr. 30, 2011 Financing lease obligations [Member] 2013 Notes [Member] | Apr. 30, 2013 New Hampshire Bonds [Member]
Proforma Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  | $ 227,500 |  |  |  |  |  |  |  |
Maturity date |  |  |  | Jan. 01, 2025 |  |  |  |  | Apr. 01, 2036 |  |  | Mar. 18, 2016 |  | Feb. 15, 2019 | Feb. 01, 2013 |  |  |  |  | Apr. 01, 2029
Additional increase in credit facility |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
Debt Covenants, description |  |  |  |  |  |  |  |  |  |  |  | The Senior Credit Facility, as amended, is subject to customary affirmative, negative and financial covenants. We entered into a third amendment under our Senior Credit Facility on June [26], 2013 to adjust our financial covenants. The amendment loosened our minimum interest coverage ratio and our maximum consolidated total funded debt to consolidated EBITDA ratio and tightened our maximum senior funded debt to consolidated EBITDA ratio and maximum allowed capital expenditures. As of April 30, 2013, 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 2.15, 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 |  |  |  |  |  |  |  |  |  |  |  | 2.15 |  |  |  |  |  |  |  |
Consolidated total funded debt to consolidated EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  | 5.85 |  |  |  |  |  |  |  |
Senior funded debt to consolidated EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  | 2.50 |  |  |  |  |  |  |  |
Available revolving credit facility |  |  |  |  |  |  |  |  |  |  |  | 69,013 |  |  |  |  |  |  |  |
Outstanding irrevocable letters of credit totaling |  |  |  |  |  |  |  |  |  |  |  | 35,287 |  |  |  |  |  |  |  |
Additional notes |  |  |  | 25,000 | 21,400 | 3,600 |  |  | 16,000 |  |  |  | 125,000 | 200,000 |  |  |  | 107,318 |  | 5,500
Additional increase in credit facility |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |
Net proceeds from the offering sale | 42,184 |  |  |  |  |  |  |  |  |  | 42,184 |  |  |  |  |  |  |  |  |
Issued discount | 1,863 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 325,000 |  |  |  |  |  |  |
Debt instrument interest rate | 6.70% |  |  | 6.25% |  |  |  |  | 4.75% |  |  |  | 7.75% |  |  | 11.00% |  |  |  |
Face (par) amount of the Second Lien Notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,682 | 72,682 |  |
Early tender premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |
Principal amount of Second Lien Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 1,000 |  |
Tender amount received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,055 | 1,060 |  |
Additional bond issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500
Loss on debt extinguishments | (15,584) | (300) | (7,390) |  |  |  | (7,390) |  |  |  |  |  |  |  |  | (15,584) |  |  |  |
Write off of deferred financing costs |  | 300 |  |  |  |  | 1,812 | 1,415 |  |  |  |  |  |  |  | 2,667 |  |  | 115 |
Write off discount |  |  |  |  |  |  | 4,976 |  |  |  |  |  |  |  |  | 2,074 |  |  |  |
Charge associated with the early tender premium |  |  |  |  |  |  |  | 1,043 |  |  |  |  |  |  |  | (10,743) |  |  |  |
Loss on consent payment |  |  |  |  |  |  |  | 1,821 |  |  |  |  |  |  |  |  |  |  |  |
Premium associated |  |  |  |  |  |  |  | 1,706 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of Bonds |  |  |  |  |  |  |  |  | 360,665 |  |  |  |  |  |  |  |  |  |  |
Carrying value of Bonds |  |  |  |  |  |  |  |  | $ 353,100 | $ 123,200 |  |  |  |  |  |  |  |  |  |

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