Document and Entity Information	3 Months Ended
	Jul. 31, 2013	Aug. 22, 2013 Class A Common Stock [Member]	Aug. 22, 2013 Class B Common Stock [Member]
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2013
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
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		38,949,366	988,200