Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
Sep. 30, 2011
Income Taxes
Valuation allowance	$ 8,400,000
Operating loss carryforwards	83,200,000
Tax credit carryforward	1,600,000
Valuation allowance recorded	1,600,000
Windfall tax benefits from stock option exercises	12,900,000
Undistributed earnings	1,300,000,000
Increase of the liability for uncertain tax positions	16,800,000
Estimated accrued interest and penalties	$ 4,900,000

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The amount as of the balance sheet date of the estimated future tax effects attributable to undistributed earnings of subsidiaries and other recognized entities in countries outside the country of domicile which will increase future taxable income when such earnings are distributed into the country of domicile.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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