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BASIS OF PRESENTATION (Details)	Jun. 30, 2023 state subsidiary
Segment Reporting Information [Line Items]
Number of states in which entity operates | state	7
Number of wholly owned subsidiaries acquired | subsidiary	4

X

- Definition

Number Of Wholly Owned Subsidiaries Acquired

+ References

No definition available.

+ Details

Name:	cwst_NumberOfWhollyOwnedSubsidiariesAcquired
Namespace Prefix:	cwst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration