Components of Income Tax Provision (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Current income tax provision (benefit):
Federal	$ 15	$ 16	$ (3,883)
State	213	1,356	616
Foreign	(1,374)	858	521
Total current income tax provision (benefit)	(1,146)	2,230	(2,746)
Deferred income tax (benefit):
Federal	(118,432)
State	(291)
Foreign	(3,413)	(276)
Total deferred income tax (benefit)	(122,136)	(276)
Income tax provision (benefit)	$ (123,282)	$ 1,954	$ (2,746)