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Accrued Capping, Closure and Post Closure (Tables)

3 Months Ended

Jul. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued capping, closure and post-closure liabilities for the three months ended July 31, 2013 and 2012 are as follows:

		Three Months Ended July 31,
		2013				2012
Beginning balance		$	43,170			$	39,629
Obligations incurred			877				1,084
Accretion expense			1,011				899
Payments			(309	)			(1,119	)
Ending balance		$	44,749			$	40,493

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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