Income Taxes	9 Months Ended
Income Taxes	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate The effective income tax rates were 19.5% and 15.9% during the quarters ended June 30, 2021 and 2020, respectively, and 16.7% and 1.8% during the nine months ended June 30, 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 nine months ended June 30, 2021 and 2020 were both impacted favorably by the recording of excess tax benefits relating to stock awards. In addition, the effective tax rate for the nine months ended June 30, 2021 was increased by the tax impact of the gain on the sale of C&R business. The total unrecognized tax benefit for uncertain tax positions was estimated to be $12.1 million and $8.0 million at June 30, 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 $0.6 million and $0.4 million related to unrecognized tax benefits as of June 30, 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.