    <SEC-DOCUMENT>0000911177-20-000022-index.html : 20200401
    <SEC-HEADER>0000911177-20-000022.hdr.sgml : 20200401
    <ACCEPTANCE-DATETIME>20200401171600
    ACCESSION NUMBER:		0000911177-20-000022
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		27
    CONFORMED PERIOD OF REPORT:	20200401
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200401
    DATE AS OF CHANGE:		20200401

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			CASELLA WASTE SYSTEMS INC
    		CENTRAL INDEX KEY:			0000911177
    		STANDARD INDUSTRIAL CLASSIFICATION:	REFUSE SYSTEMS [4953]
    		IRS NUMBER:				030338873
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-23211
    		FILM NUMBER:		20766300

    	BUSINESS ADDRESS:
    		STREET 1:		25 GREENS HILL ROAD
    		CITY:			RUTLAND
    		STATE:			VT
    		ZIP:			05701
    		BUSINESS PHONE:		8027750325

    	MAIL ADDRESS:
    		STREET 1:		25 GREENS HILL ROAD
    		CITY:			RUTLAND
    		STATE:			VT
    		ZIP:			05701
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>cwst-20200401.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: cwst-20200401.htm

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    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>cwst041020investorupdate.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: cwst041020investorupdate.htm

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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>cwst-20200401.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: cwst-20200401.xsd

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    <FILENAME>cwst-20200401_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: cwst-20200401_cal.xml

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    <FILENAME>cwst-20200401_def.xml
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    Document 5 - file: cwst-20200401_def.xml

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    <FILENAME>cwst041020investorupdate001.jpg
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    <FILENAME>cwst041020investorupdate002.jpg
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    <SEQUENCE>10
    <FILENAME>cwst041020investorupdate003.jpg
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    Document 10 - file: cwst041020investorupdate003.jpg

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    <FILENAME>cwst041020investorupdate004.jpg
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    Document 11 - file: cwst041020investorupdate004.jpg

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    <SEQUENCE>12
    <FILENAME>cwst041020investorupdate005.jpg
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    Document 12 - file: cwst041020investorupdate005.jpg

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    <FILENAME>cwst041020investorupdate006.jpg
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    Document 13 - file: cwst041020investorupdate006.jpg

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    Document 14 - file: cwst041020investorupdate007.jpg

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    <FILENAME>cwst041020investorupdate008.jpg
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    Document 15 - file: cwst041020investorupdate008.jpg

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    <FILENAME>cwst041020investorupdate009.jpg
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    Document 16 - file: cwst041020investorupdate009.jpg

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    <FILENAME>cwst041020investorupdate010.jpg
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    Document 17 - file: cwst041020investorupdate010.jpg

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    <FILENAME>cwst041020investorupdate011.jpg
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    Document 18 - file: cwst041020investorupdate011.jpg

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    <SEQUENCE>19
    <FILENAME>cwst041020investorupdate012.jpg
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    Document 19 - file: cwst041020investorupdate012.jpg

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    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: R1.htm

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    <SEQUENCE>21
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    <TYPE>ZIP
    <SEQUENCE>22
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    Document 22 - file: 0000911177-20-000022-xbrl.zip

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>report.css
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    <TEXT>
    Document 24 - file: report.css

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    <SEQUENCE>25
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    <TEXT>
    Document 25 - file: Show.js

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>26
    <FILENAME>cwst-20200401_htm.xml
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    Document 26 - file: cwst-20200401_htm.html

    Document 26 - RAW XML: cwst-20200401_htm.xml

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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>27
    <FILENAME>MetaLinks.json
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    <TEXT>
    Document 27 - file: MetaLinks.json

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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>28
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: Financial_Report.xlsx

    </DOCUMENT>
    </SEC-DOCUMENT>