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Employee Benefit Plans (Notes) | 6 Months Ended
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Mar. 31, 2020
Retirement Benefits [Abstract] |
Compensation and Employee Benefit Plans [Text Block] | . EMPLOYEE BENEFIT PLANS 401(k) Plan In November 1998, we established the IES Holdings, Inc. 401(k) Retirement Savings Plan. All full-time IES employees and full-time employees of participating subsidiaries are eligible to participate on the first day of the month subsequent to completing sixty days of service and attaining age twenty-one. Participants become vested in our matching contributions following three years of service. We also maintain several subsidiary retirement savings plans. During the three months ended March 31, 2020 and 2019, we recognized $697 and $600, respectively, in matching expense. During the six months ended March 31, 2020 and 2019, we recognized $1,082 and $1,023, respectively, in matching expense. Post Retirement Benefit Plans Certain individuals at one of the Company’s locations are entitled to receive fixed annual payments pursuant to post retirement benefit plans. We had an unfunded benefit liability of $709 and $738 recorded as of March 31, 2020 and September 30, 2019, respectively, related to such plans.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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