Document and Entity Information	6 Months Ended
	Oct. 31, 2013	Nov. 15, 2013 Class A Common Stock [Member]	Nov. 15, 2013 Class B Common Stock [Member]
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2013
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
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		39,011,087	988,200