Discontinued Operations - Operating Results from Discontinued Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]
(Loss) income from discontinued operations	$ (260)	$ 1,136
Income tax benefit (provision)	84	(548)
(Loss) income from discontinued operations, net of income taxes	$ (176)	$ 588
Income tax benefit			$ (600)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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