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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
New York Attorney General Matter [Member]
Oct. 31, 2014
Greenwood Street Landfill [Member]
Oct. 31, 2014
Greenwood Street Landfill [Member]
Administrative Penalty [Member]
Oct. 31, 2014
Minimum [Member]
New York Attorney General Matter [Member]
Jul. 31, 2014
General and Administration Costs [Member]
New York Attorney General Matter [Member]
Oct. 31, 2014
General and Administration Costs [Member]
Greenwood Street Landfill [Member]
Oct. 31, 2014
Potsdam Environmental Remediation Liability [Member]
acre
Apr. 30, 2011
Potsdam Environmental Remediation Liability [Member]
May 31, 2009
Potsdam Environmental Remediation Liability [Member]
Sep. 30, 2011
Potsdam Environmental Remediation Liability [Member]
Waste-Stream Inc. [Member]
Nov. 30, 2011
Potsdam Environmental Remediation Liability [Member]
Motors Liquidation Trust [Member]
Oct. 31, 2014
Southbridge Landfill [Member]
Condition One [Member]
Jul. 31, 2014
Southbridge Landfill [Member]
Condition One [Member]
Oct. 31, 2014
Southbridge Landfill [Member]
Condition One [Member]
Apr. 30, 2014
Southbridge Landfill [Member]
Condition One [Member]
Contingencies And Commitments [Line Items]                                      
Minimum acquisition value for post acquisition notice               $ 350                      
Litigation settlement         100 67 201                        
Litigation settlement charge                 100 172                  
Scrap yard and solid waste transfer station                     25                
Estimate of total undiscounted costs associated with implementing the preferred remedies                       12,130 10,219            
Future remediation costs                           3,000 100        
Risk free interest rate                     2.00%                
Anticipated remediation costs                                   2,997  
Loss contingency range of possible loss minimum                               850   850  
Loss contingency range of possible loss maximum                               2,997   2,997  
Environmental remediation charge $ 375 $ 150 $ 450 $ 150                       $ 375 $ 75   $ 400