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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
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