XML 103 R1.htm IDEA: XBRL DOCUMENT v2.4.0.8
Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Oct. 31, 2013
May 31, 2014
Class A Common Stock [Member]
May 31, 2014
Class B Common Stock [Member]
Document Information [Line Items]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Apr. 30, 2014      
Document Fiscal Year Focus 2014      
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     39,121,079 988,200
Entity Public Float   $ 218.7