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Document and Entity Information (USD $)
 12 Months Ended
Apr. 30, 2013
Oct. 31, 2012
May 31, 2013
Class A Common Stock [Member]
May 31, 2013
Class B Common Stock [Member]
Entity Information [Line Items]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Apr. 30, 2013      
Document Fiscal Year Focus 2013      
Document Fiscal Period Focus FY      
Trading Symbol CWST      
Entity Registrant Name CASELLA WASTE SYSTEMS INC      
Entity Central Index Key 0000911177      
Current Fiscal Year End Date --04-30      
Entity Well-known Seasoned Issuer No      
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Filer Category Accelerated Filer      
Entity Common Stock, Shares Outstanding     38,667,282 988,200
Entity Public Float   $ 173,812,415