Components of Acquisition-Related Costs, Net (Detail) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Acquisition [Line Items]
Transition and integration costs	$ 453	$ 3,383	$ 1,506	$ 12,035
Professional service fees	7,775	3,079	11,107	14,933
Acquisition-related adjustments	367	(337)	1,297	(76)
Total	$ 8,595	$ 6,125	$ 13,910	$ 26,892