Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Change in valuation allowance	$ 2,629,000	$ 2,920,000
Excess tax deductions from share-based compensation	64,300,000
Federal research and development credits	11,200,000
Undistributed foreign earnings	4,800,000
Unrecognized deferred tax liability for indefinitely reinvested foreign earnings	1,800,000
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	149,000
Unrecognized Tax Benefits	5,500,000	4,900,000
Prior period reclassification adjustment		17,400,000
Deferred tax liability, noncurrent		1,100,000
Minimum
Federal research and development credits, expiration date	Sep. 30, 2017
Maximum
Federal research and development credits, expiration date	Sep. 30, 2033
Internal Revenue Service (IRS) [Member]
Net operating loss carryforwards	211,000,000
Internal Revenue Service (IRS) [Member] | Minimum
Net operating loss carryforwards, expiration date	Sep. 30, 2020
Internal Revenue Service (IRS) [Member] | Maximum
Net operating loss carryforwards, expiration date	Sep. 30, 2031
Foreign
Net operating loss carryforwards	$ 28,800,000