Document and Entity Information	3 Months Ended
	Jul. 31, 2014	Aug. 15, 2014 Class A Common Stock [Member]	Aug. 15, 2014 Class B Common Stock [Member]
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2014
Document Fiscal Year Focus	2015
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		39,451,203	988,200