Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Change in valuation allowance	$ 2,920,000	$ 257,000
Undistributed Foreign Earnings	4,400,000
Income Tax Holiday Range Low	4 years
Income Tax Holiday Range High	6 years
Income Tax Holiday, Termination Date	2018
Income Tax Holiday, Aggregate Dollar Amount	117,000
Excess tax deductions from share-based compensation	158,700,000
Unrecognized Tax Benefits	4,900,000	4,300,000
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	178,500,000
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 14,400,000
Minimum [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Operating loss carryforward expiration date	2017
Maximum [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Operating loss carryforward expiration date	2030