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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Income Tax Disclosure [Abstract] |  |  |
Statutory rate | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit | 3.00% | 3.00% | 2.00%
Research and development credit | (21.00%) |  |
International withholding tax |  |  | (1.00%)
Other permanent tax items | 2.00% | 1.00% | 1.00%
Foreign rate differential | 4.00% | 1.00% | (1.00%)
Domestic production activities deduction | (3.00%) | (3.00%) | (3.00%)
Foreign valuation allowance and other | 39.00% | (1.00%) | (17.00%)
Effective rate | 59.00% | 36.00% | 16.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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