Income Taxes	6 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company’s income tax expense for the three and six months ended March 31, 2021 was $246.0 million and $485.1 million, respectively, compared to $137.3 million and $228.1 million in the prior year periods. The effective tax rate was 20.8% and 21.9% for the three and six months ended March 31, 2021 compared to 22.1% and 19.9% in the prior year periods. The effective tax rates for all periods include an expense for state income taxes and tax benefits related to stock-based compensation and the federal energy efficient homes tax credit. For the six months ended March 31, 2020, the retroactive reinstatement of the federal energy efficient homes tax credit reduced the effective tax rate by 2.6%. For the three and six months ended March 31, 2021, a change in the estimate of homes qualifying for the fiscal 2020 retroactive extension of the energy efficient tax credit reduced the effective tax rate by 0.6% and 0.3%, respectively. The Company’s deferred tax assets, net of deferred tax liabilities, were $150.2 million at March 31, 2021 compared to $152.4 million at September 30, 2020. The Company has a valuation allowance of $7.4 million and $7.5 million at March 31, 2021 and September 30, 2020, respectively, related to state deferred tax assets for net operating loss (NOL) carryforwards that are more likely than not to expire before being realized. The Company will continue to evaluate both the positive and negative evidence in determining the need for a valuation allowance with respect to the remaining state NOL carryforwards. Any reversal of the valuation allowance in future periods will impact the Company’s effective tax rate. The accounting for deferred taxes is based upon estimates of future results. Differences between the anticipated and actual outcomes of these future results could have a material impact on the Company’s consolidated results of operations or financial position. Also, changes in existing federal and state tax laws and tax rates could affect future tax results and the valuation of the Company’s deferred tax assets.

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.