Income Taxes (Details Texuals) (USD $)	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Income Taxes (Textuals) [Abstract]
Net current deferred tax assets	$ 287,143,000	$ 217,865,000
Net non-current deferred tax assets	111,786,000	152,334,000
Net current deferred tax liabilities	7,522,000	2,587,000
Net non-current deferred tax liabilities	58,553,000	21,558,000
Cumulative amount of undistributed earnings reinvested in foreign operation	3,800,000,000
Accrued unrecognized tax benefits Interest and Penalties	8,977,000
Unrecognized tax benefits interest and penalties reflected in current year	656,000
Net state operating losses and credit carryforward	40,653,000
Operating losses and credit valuation allowance	26,800,000
Tax reductions related to tax holidays	60,275,000	51,300,000	44,800,000
Net of income tax refunds	$ 512,092,000	$ 391,965,000	$ 368,724,000
Expiration period of tax holidays	Through 2023
Maximum [Member]
Income Tax [Line Items]
Expiration period of deferred tax assets	2014
Minimum [Member]
Income Tax [Line Items]
Expiration period of deferred tax assets	2012