Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2011

Goodwill and Intangible Assets [Abstract]

Components of Intangible Assets

	2011			2010
Subject to amortization:
Customer relationships and noncompete agreements	$	77,213		$	65,203
Accumulated amortization		(35,671	)		(27,613	)
	$	41,542		$	37,590
Not Subject to amortization:
Goodwill	$	691,910		$	678,721

Changes in the carrying amount of goodwill

Balance September 30, 2009	$	665,663
Goodwill acquired		12,930
Purchase accounting adjustments		128
Balance September 30, 2010		678,721
Goodwill acquired		13,053
Purchase accounting adjustments		136
Balance September 30, 2011	$	691,910