New Accounting Pronouncements	6 Months Ended
Mar. 31, 2020
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the FASB issued an Accounting Standard Update ("ASU") 2016-02, Leases (Topic 842), to improve financial reporting about leasing transactions. This accounting standard requires organizations that lease assets, referred to as "Lessees", to recognize on the balance sheet right-of-use assets and lease liabilities. Per the ASU, we determine if a contract contains a lease by identifying an asset and determining if we have the right to control the use of the identified asset for a period of time in exchange for consideration. A contract conveys the right to control the use of an identified asset when the lessee has the right to direct the use of the identified asset and obtain substantially all economic benefits from its use throughout the period of its use. We also determine if a lease qualifies as an operating or finance lease. All Company leases at standard adoption were operating leases. The ASU also require lessees to identify and separate lease and non-lease components. The Company elected not to separate lease and non-lease components per the practical expedient provided in ASU 2018-11. Upon lease commencement, the lease liability and right-of-use asset are recorded on the balance sheet. The lease liability is measured as the present value of future minimum lease payments, including all probable renewals, to be made during the lease term. The right-of-use asset is measured as the present value of future minimum lease payments to be made during the lease term, including all probable renewals, plus lease payments made to the lessor before or at commencement and indirect costs paid less lease incentives received. DLH adopted this standard on October 1, 2019 and recognized initial right-of use assets and lease liabilities of $17.4 million and $18.0 million, respectively. At adoption, the Company elected several practical expediencies to facilitate the implementation of the new standard and did not recast comparative prior year information. As such we did not reassess and include initial direct costs in the measurement of right-of-use assets, capitalize leases with terms of 12 months or less, nor reassess lease classification of existing leases. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which requires companies to record an allowance for expected credit losses over the contractual term of certain financial assets, including short-term trade receivables and contract assets. Additionally, it expands disclosure requirements for credit quality of financial assets. ASU 2016-13 becomes effective for the Company in the first quarter of fiscal year 2021. We do not expect a material impact to our operating results, financial position or cash flows as a result of adopting this new standard. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment, which simplifies the accounting for goodwill impairments by eliminating step two from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. ASU 2017-04 also clarifies that an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new standard is effective for fiscal years beginning after December 15, 2019 for both interim and annual reporting periods. The Company has adopted this standard in the first quarter of fiscal 2020 and adoption did not have an impact on the Company's consolidated financial statements.

New Accounting Pronouncements

In February 2016, the FASB issued an Accounting Standard Update ("ASU") 2016-02, Leases (Topic 842), to improve financial reporting about leasing transactions. This accounting standard requires organizations that lease assets, referred to as "Lessees", to recognize on the balance sheet right-of-use assets and lease liabilities. Per the ASU, we determine if a contract contains a lease by identifying an asset and determining if we have the right to control the use of the identified asset for a period of time in exchange for consideration. A contract conveys the right to control the use of an identified asset when the lessee has the right to direct the use of the identified asset and obtain substantially all economic benefits from its use throughout the period of its use. We also determine if a lease qualifies as an operating or finance lease. All Company leases at standard adoption were operating leases. The ASU also require lessees to identify and separate lease and non-lease components. The Company elected not to separate lease and non-lease components per the practical expedient provided in ASU 2018-11. Upon lease commencement, the lease liability and right-of-use asset are recorded on the balance sheet. The lease liability is measured as the present value of future minimum lease payments, including all probable renewals, to be made during the lease term. The right-of-use asset is measured as the present value of future minimum lease payments to be made during the lease term, including all probable renewals, plus lease payments made to the lessor before or at commencement and indirect costs paid less lease incentives received. DLH adopted this standard on October 1, 2019 and recognized initial right-of use assets and lease liabilities of $17.4 million and $18.0 million, respectively. At adoption, the Company elected several practical expediencies to facilitate the implementation of the new standard and did not recast comparative prior year information. As such we did not reassess and include initial direct costs in the measurement of right-of-use assets, capitalize leases with terms of 12 months or less, nor reassess lease classification of existing leases.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which requires companies to record an allowance for expected credit losses over the contractual term of certain financial assets, including short-term trade receivables and contract assets. Additionally, it expands disclosure requirements for credit quality of financial assets. ASU 2016-13 becomes effective for the Company in the first quarter of fiscal year 2021. We do not expect a material impact to our operating results, financial position or cash flows as a result of adopting this new standard.

In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment, which simplifies the accounting for goodwill impairments by eliminating step two from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. ASU 2017-04 also clarifies that an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new standard is effective for fiscal years beginning after December 15, 2019 for both interim and annual reporting periods. The Company has adopted this standard in the first quarter of fiscal 2020 and adoption did not have an impact on the Company's consolidated financial statements.