The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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The cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with generally accepted accounting principles that will result in taxable amounts in one or more future periods.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income tax
Estimated effective income tax rate (as a percent)	(16.00%)	(16.00%)	(2.00%)	(16.00%)	(2.00%)
Income tax expense (benefit) for discrete items		$ 0.6	$ 0.9
Deferred tax position						0
Net operating loss and capital carryforwards	70.2	70.2
Tax credit carryforwards	$ 21.7	$ 21.7
Maximum
Income tax
Operating loss carryforwards expiration date		2012
Tax credit carryforwards, expiration date		2014
Minimum
Income tax
Operating loss carryforwards expiration date		2032
Tax credit carryforwards, expiration date		2032