Income Taxes	9 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes DLH accounts for income taxes in accordance with the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities, using enacted tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reflected on the balance sheet when it is determined that it is more likely than not that the asset will be realized. This guidance also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax asset will not be realized. On December 22, 2017, the Tax Cuts and Jobs Act (the “2017 Tax Act”) was enacted. The 2017 Tax Act significantly reduces U.S. federal tax rates, modifies rules regarding deductibility of executive compensation, limits deductions of interest expense, and revises rules regarding usability of net operating losses. Net income for the nine months ended June 30, 2018 includes an aggregate net discrete tax provision of $3.4 million as a result of the 2017 Tax Act, principally associated with revaluing the benefits of our net operating loss carryforwards from the previously recognized 34% federal rate to the 21% rate enacted. As of June 30, 2018, the Company is reporting a $4.9 million deferred tax asset, which is presented on the balance sheet as deferred taxes in the long-term assets section.

Income Taxes

DLH accounts for income taxes in accordance with the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities, using enacted tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reflected on the balance sheet when it is determined that it is more likely than not that the asset will be realized. This guidance also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax asset will not be realized.

On December 22, 2017, the Tax Cuts and Jobs Act (the “2017 Tax Act”) was enacted. The 2017 Tax Act significantly reduces U.S. federal tax rates, modifies rules regarding deductibility of executive compensation, limits deductions of interest expense, and revises rules regarding usability of net operating losses.

Net income for the nine months ended June 30, 2018 includes an aggregate net discrete tax provision of $3.4 million as a result of the 2017 Tax Act, principally associated with revaluing the benefits of our net operating loss carryforwards from the previously recognized 34% federal rate to the 21% rate enacted. As of June 30, 2018, the Company is reporting a $4.9 million deferred tax asset, which is presented on the balance sheet as deferred taxes in the long-term assets section.