Discontinued operations - Summary of Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income from discontinued operations	$ 8	$ 20	$ 11	$ 5,125
Discontinued Operations
Revenue	15	15	45	45
Operating expenses	2	(18)	27	(278)
Gain on sale before taxes				4,665
Income before income taxes	13	33	18	4,988
Permanent tax benefit				2,053
Provision for income taxes	(5)	(13)	(7)	(1,916)
Income from discontinued operations	$ 8	$ 20	$ 11	$ 5,125

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.

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- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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