XML 59 R1.htm IDEA: XBRL DOCUMENT v2.4.0.6
Document and Entity Information
 9 Months Ended
Jan. 31, 2013
Feb. 28, 2013
Class A Common Stock [Member]
Feb. 28, 2013
Class B Common Stock [Member]
Entity Information [Line Items]      
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Jan. 31, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q3    
Trading Symbol CWST    
Entity Registrant Name CASELLA WASTE SYSTEMS INC    
Entity Central Index Key 0000911177    
Current Fiscal Year End Date --04-30    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   38,657,836 988,200