Provision for Income Taxes (Detail) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Current:
Federal	$ 22,019	$ 10,190	$ 16,704
State	2,873	4,406	4,979
Foreign	(251)	6,490	15,453
Current Income Tax Expense (Benefit), Total	24,641	21,086	37,136
Deferred:
Federal	59	7,761	(2,317)
State	(112)	(644)	(2,018)
Foreign	1,305	(356)	(696)
Deferred Income Tax Expense (Benefit), Total	1,252	6,761	(5,031)
Recorded income tax provision	$ 25,893	$ 27,847	$ 32,105