Discontinued Operations - Operating Results from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Discontinued Operations And Disposal Groups [Abstract]
Total revenue		$ 5,297	$ 15,109
Income (loss) from discontinued operations	1,136	2,309	(43,197)
Income tax (provision) benefit	(548)	(1,133)	13,766
Income (loss) from discontinued operations, net of income taxes	588	1,176	(29,431)
Loss on sale of discontinued operations		(1,691)
Income tax benefit		617
Loss on sale of discontinued operations, net of income taxes		$ (1,074)