Income Taxes	6 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate The effective income tax rate was 28.1% and 27.5% during the quarters ended March 31, 2016 and 2015, respectively and 24.3% and 25.0% during the six months ended March 31, 2016 and 2015, respectively. The provision for income taxes during interim quarterly reporting periods is based on our estimates of the effective tax rates for the full fiscal year. The effective tax rate in any quarter can also be affected positively or negatively by adjustments that are required to be reported in the specific quarter of resolution. The effective rates for both periods were significantly impacted by the mix of global earnings toward lower tax jurisdictions, as well as retroactive extensions of the U.S. Federal Research and Development Credit. The total unrecognized tax benefit for uncertain tax positions is estimated to be approximately $5.7 million and $4.6 million at March 31, 2016 and September 30, 2015, respectively. We recognize interest expense related to unrecognized tax benefits and penalties as part of the provision for income taxes in our condensed consolidated statements of income and comprehensive income. We have accrued interest of $0.3 million and $0.2 million, related to unrecognized tax benefits as of March 31, 2016 and September 30, 2015, respectively.

Income Taxes

6 Months Ended

Mar. 31, 2016

Effective Tax Rate

The effective income tax rate was 28.1% and 27.5% during the quarters ended March 31, 2016 and 2015, respectively and 24.3% and 25.0% during the six months ended March 31, 2016 and 2015, respectively. The provision for income taxes during interim quarterly reporting periods is based on our estimates of the effective tax rates for the full fiscal year. The effective tax rate in any quarter can also be affected positively or negatively by adjustments that are required to be reported in the specific quarter of resolution. The effective rates for both periods were significantly impacted by the mix of global earnings toward lower tax jurisdictions, as well as retroactive extensions of the U.S. Federal Research and Development Credit.

The total unrecognized tax benefit for uncertain tax positions is estimated to be approximately $5.7 million and $4.6 million at March 31, 2016 and September 30, 2015, respectively. We recognize interest expense related to unrecognized tax benefits and penalties as part of the provision for income taxes in our condensed consolidated statements of income and comprehensive income. We have accrued interest of $0.3 million and $0.2 million, related to unrecognized tax benefits as of March 31, 2016 and September 30, 2015, respectively.