GOODWILL AND INTANGIBLE ASSETS

9 Months Ended

Jan. 31, 2012

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 January 31, 2012:

	April 30, 2011		Acquisitions		January 31, 2012
Eastern region	$	38	$	22	$	60
Western region	88,976		547		89,523
Recycling	12,190		—		12,190
Total	$	101,204	$	569	$	101,773

Intangible assets as of January 31, 2012 and April 30, 2011 consist of the following:

	Covenants Not to Compete			Client Lists			Total
Balance, January 31, 2012
Intangible assets	$	15,601		$	3,093		$	18,694
Less accumulated amortization	(14,229		)	(1,326		)	(15,555		)
	$	1,372		$	1,767		$	3,139
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 nine months ended January 31, 2012 and 2011 was $156, $204, $460 and $636, 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
$	688	$	651	$	603	$	552	$	372	$	733