Income Taxes	6 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate The effective income tax rates were 25.2% and 6.7% during the quarters ended March 31, 2021 and 2020, respectively, and 13.7% and (8.5)% during the six months ended March 31, 2021 and 2020, 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 tax rates for the six months ended March 31, 2021 and 2020 were both impacted by the recording of excess tax benefits relating to stock awards. In addition, stock exercises during the quarter and six months ended March 31, 2020 resulted in an additional increase in excess benefits. The total unrecognized tax benefit for uncertain tax positions was estimated to be $10.2 million and $8.0 million at March 31, 2021 and September 30, 2020, 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 accrued interest of $0.5 million and $0.4 million related to unrecognized tax benefits as of March 31, 2021 and September 30, 2020, respectively.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.