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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Sep. 30, 2018
Retirement Benefits [Abstract]
Employee Benefits Plans	Employee Benefit Plans As of September 30, 2018, DLH and its subsidiaries maintain the DLH 401(k) Plan (the "401(k) Plan"), a defined contribution and supplemental pension plan for the benefit of its eligible employees. DLH may provide a discretionary matching contribution of a participant's elective contributions under the 401 (k) Plan. DLH recorded related expense of $222 thousand in fiscal 2018 and $154 thousand in fiscal year 2017. A participant is always fully vested in his or her elective contributions and vests in Company matching contributions over a four year period.