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Long-Term Debt and Capital Leases (Narrative) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 9 Months Ended 4 Months Ended 9 Months Ended
Jan. 31, 2013
Jan. 31, 2013
Sep. 20, 2012
Jan. 31, 2013
Oct. 09, 2012
Jan. 31, 2013
Class A Common Stock [Member]
Jan. 31, 2013
Senior Credit Facility [Member]
Jan. 31, 2013
Senior Secured Second Lien Notes, Due 2014 [Member]
Apr. 30, 2012
Senior Secured Second Lien Notes, Due 2014 [Member]
Nov. 08, 2012
Second Lien Notes [Member]
Oct. 09, 2012
Second Lien Notes [Member]
Jan. 31, 2013
Senior Subordinated Notes [Member]
Class A Common Stock [Member]
Oct. 09, 2012
Senior Subordinated Notes [Member]
Class A Common Stock [Member]
Jan. 31, 2012
Senior Subordinated Notes [Member]
Class A Common Stock [Member]
Jan. 31, 2013
2011 Revolver [Member]
Debt Instrument [Line Items]                              
Revolving credit facility           $ 50,000                  
Proceeds from senior credit facility               180,000              
Maximum borrowing capacity of senior subordinated debt   450,000 350,000                        
Debt instrument, interest rate               11.00%       7.75%      
Maturity date               Jul. 15, 2014       Feb. 15, 2019      
Face (par) amount of the Second Lien Notes outstanding                     72,682        
Tendered amount received                   1,055 1,060        
Principal amount of Second Lien Notes         1,000         1,000 1,000        
Early tender premium                     30        
Additional notes                   72,682 107,318     125,000  
Discount on notes issued               0 3,536       1,863    
Net equity proceeds from the offering sale       42,184                      
Revolving credit facility                             50,000
Coverage ratio             2.00                
Consolidated total funded debt to consolidated EBITDA ratio             5.75                
Senior funded debt to consolidated EBITDA ratio             2.75                
Ratio of restricted capital expenditure             1.5                
Debt covenants, description             The Senior Credit Facility, as amended, is subject to customary affirmative, negative and financial covenants. As of January 31, 2013, these covenants restrict fiscal year capital expenditures to 1.5 times our consolidated depreciation expenses, depletion expenses and landfill amortization expenses, set a minimum interest coverage ratio of 2.00, a maximum consolidated total funded debt to consolidated EBITDA ratio of 5.75 and a maximum senior funded debt to consolidated EBITDA ratio of 2.75. In addition to the financial covenants described above, the Senior Credit Facility, as amended, also contains a number of important negative covenants which restrict, among other things, our ability to sell assets, pay dividends, repurchase stock, incur debt, grant liens and issue preferred stock. As of January 31, 2013, we were in compliance with all covenants under the indenture governing the Senior Credit Facility and we do not believe that these restrictions impact our ability to meet future liquidity needs except that they may impact our ability to increase our investments in third parties, including the joint ventures to which we are already party to.                
Loss on debt extinguishment 5,914     15,584                      
Write off of deferred financing costs 1,100     2,667                      
Write off of discount 816     2,074                      
Charge associated with the early tender premium $ 3,998     $ 10,743