GOODWILL AND INTANGIBLE ASSETS

6 Months Ended

Oct. 31, 2011

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

3. GOODWILL AND INTANGIBLE ASSETS

The following table shows the activity and balances related to goodwill from April 30, 2011 through October 31, 2011:

	April 30, 2011		Acquisitions		October 31, 2011
Eastern region	$	38	$	22	$	60
Western region	88,976		103		89,079
Recycling	12,190		—		12,190
Total	$	101,204	$	125	$	101,329

Intangible assets as of October 31, 2011 and April 30, 2011 consist of the following:

	Covenants Not to Compete			Client Lists			Total
Balance, October 31, 2011
Intangible assets	$	15,187		$	2,680		$	17,867
Less accumulated amortization	(14,141		)	(1,258		)	(15,399		)
	$	1,046		$	1,422		$	2,468
Balance, April 30, 2011
Intangible assets	$	15,076		$	2,474		$	17,550
Less accumulated amortization	(13,966		)	(1,129		)	(15,095		)
	$	1,110		$	1,345		$	2,455

Intangible amortization expense for the three and six months ended October 31, 2011 and 2010 was $151, $213, $304 and $432, respectively. The intangible amortization expense estimated for the five fiscal years following fiscal year 2011 and thereafter is as follows:

2012		2013		2014		2015		2016		Thereafter
$	589	$	532	$	484	$	434	$	256	$	477