Income Taxes	9 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate The effective income tax rate was 34.7% and 32.2% during the quarters ended June 30, 2015 and 2014, respectively and 28.9% and 34.4% during the nine months ended June 30, 2015 and 2014, respectively. The provision for income taxes during interim quarterly reporting periods is based on our estimates of the effective tax rates for the respective 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 decrease in our effective tax rate year over year was primarily due to the retroactive extension of the U.S. Federal Research and Development Credit through 2014, which was enacted during the first quarter of our fiscal 2015, as well as lower foreign tax expense. The total unrecognized tax benefit for uncertain tax positions is estimated to be approximately $5.2 million and $4.6 million at June 30, 2015 and September 30, 2014, 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 $0.7 million and $0.5 million, related to unrecognized tax benefits as of June 30, 2015 and September 30, 2014, respectively.

Income Taxes

9 Months Ended

Jun. 30, 2015

Effective Tax Rate

The effective income tax rate was 34.7% and 32.2% during the quarters ended June 30, 2015 and 2014, respectively and 28.9% and 34.4% during the nine months ended June 30, 2015 and 2014, respectively. The provision for income taxes during interim quarterly reporting periods is based on our estimates of the effective tax rates for the respective 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 decrease in our effective tax rate year over year was primarily due to the retroactive extension of the U.S. Federal Research and Development Credit through 2014, which was enacted during the first quarter of our fiscal 2015, as well as lower foreign tax expense.

The total unrecognized tax benefit for uncertain tax positions is estimated to be approximately $5.2 million and $4.6 million at June 30, 2015 and September 30, 2014, 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 $0.7 million and $0.5 million, related to unrecognized tax benefits as of June 30, 2015 and September 30, 2014, respectively.