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BASIS OF PRESENTATION (Details)	Jun. 30, 2023 subsidiary	Sep. 30, 2023 state
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states in which entity operates | state		9
Number of wholly owned subsidiaries acquired | subsidiary	4

X

- Definition

Number Of Wholly Owned Subsidiaries Acquired

+ References

No definition available.

+ Details

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Namespace Prefix:	cwst_
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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

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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