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

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Debt Instrument Additional Borrowings Feature

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Minimum interest coverage ratio based on our senior credit facility.

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Additional discretionary borrowing capacity available under the credit facility upon request and subject to certain conditions set forth in the agreement.

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Maximum debt to EBITDA ratio.

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Maximum senior funded debt to adjusted EBITDA ratio.

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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.

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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.

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

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

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

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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.

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The cash inflow from the additional capital contribution to the entity.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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