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Income Taxes
 6 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes

12.

Income Taxes

Our effective tax rate (ETR) from continuing operations was 22.4% and 22.4% for the three and six months ended March 31, 2022, respectively, and 24.9% and 25.3% for the three and six months ended March 31, 2021, respectively. Our ETR during the three and six months ended March 31, 2022 was different from the prior year tax rates primarily as a result of vesting of stock compensation, changes in the valuation allowance against state net operating losses, and changes in state statutory rates. For the six months ended March 31, 2022, we used the year-to-date effective tax rate method to determine the interim income tax benefit because a reliable estimate of the annual effective tax rate could not be made.

We continue to maintain a valuation allowance on a portion of our state net operating losses in jurisdictions with shortened carryforward periods or in jurisdictions where our operations have significantly decreased as compared to prior years in which the net operating losses were generated.

As of September 30, 2021, we had aggregate federal and state net operating loss carryforwards of approximately $541.3 million and $235.7 million, respectively, which expire in fiscal years 2027-2038 and 2022-2041, respectively. Approximately $1.2 million of state net operating loss carryforwards are expected to expire in the current fiscal year.