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v3.23.2

BASIS OF PRESENTATION (Details) | Jun. 30, 2023 state subsidiary
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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