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Development Project Charges	12 Months Ended
	Apr. 30, 2013
Development Project Charges	16. DEVELOPMENT PROJECT CHARGES In the second quarter of fiscal year 2012, we recorded a charge of $131 for deferred costs associated with certain development projects no longer deemed viable. As of April 30, 2013 and 2012, we had $1,644 and $1,163 of deferred costs associated with development projects included in other non-current assets within our consolidated balance sheets.

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- Definition

The entire disclosure for the write-off of deferred costs associated with development projects no longer deemed viable.

+ References

No definition available.

+ Details

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Namespace Prefix:	cwst_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration