IES (IESC) 10-Q 5 Aug 21 2021 Q3 Quarterly report Financial data

DEI Document

DEI Document - shares	9 Months Ended
	Jun. 30, 2021	Aug. 03, 2021
Entity Information [Line Items]
Entity File Number	001-13783
Entity Registrant Name	IES Holdings, Inc.
Document Period End Date	Jun. 30, 2021
Document Quarterly Report	true
Document Transition Report	false
Entity Central Index Key	0001048268
Entity Incorporation, State or Country Code	DE
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Tax Identification Number	76-0542208
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	IESC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Address, Address Line One	5433 Westheimer Road
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056
City Area Code	713
Local Phone Number	860-1500
Entity Common Stock, Shares Outstanding		20,856,736

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 18,524	$ 53,577
Accounts receivable	243,853	213,016
Accounts and Other Receivables, Net, Current	39,159	40,878
Inventories	71,562	24,889
Costs and estimated earnings in excess of billings	31,962	29,937
Prepaid expenses and other current assets	20,166	9,153
Total current assets	425,226	371,450
Property and equipment, net	35,932	24,589
Goodwill	92,027	53,763
Intangible assets, net	89,301	39,357
Deferred tax assets	23,992	33,803
Operating right of use assets	42,677	31,786
Other non-current assets	6,775	5,780
Total assets	715,930	560,528
Accounts payable and accrued expenses	222,271	186,710
Billings in excess of costs and estimated earnings	67,235	55,739
Total current liabilities	289,506	242,449
Long-term debt	30,576	217
Operating long-term lease liabilities	28,750	20,530
Other non-current liabilities	15,542	12,215
Total liabilities	364,374	275,411
Noncontrolling interest	23,367	1,804
Preferred stock, value	0	0
Common stock, value	220	220
Treasury stock, value	(23,783)	(24,499)
Additional paid-in capital	201,126	200,587
Retained earnings	150,626	107,005
Total stockholders' equity	328,189	283,313
Total liabilities and stockholders' equity	$ 715,930	$ 560,528

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ (1,278)	$ (2,613)
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	22,049,529	22,049,529
Common Stock, Shares, Outstanding	20,856,736	20,762,395
Treasury Stock, Shares	1,192,793	1,287,134

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 405,871	$ 293,125	$ 1,052,670	$ 860,445
Cost of services	333,042	234,805	856,288	700,646
Gross profit	72,829	58,320	196,382	159,799
Selling, general and administrative expenses	50,342	44,261	140,783	124,169
Contingent consideration	69	0	142	0
Loss (gain) on sale of assets	(32)	(3)	(24)	(40)
Operating income (loss)	22,450	14,062	55,481	35,670
Interest expense	240	269	637	828
Other (income) expense, net	(79)	(232)	(248)	177
Income (loss) from operations before income taxes	22,289	14,025	55,092	34,665
Provision for (benefit from) income taxes	2,640	1,695	9,890	7,592
Net income (loss)	19,649	12,330	45,202	27,073
Net income attributable to noncontrolling interest	(348)	(70)	(967)	(80)
Comprehensive income attributable to IES Holdings, Inc.	$ 19,301	$ 12,260	$ 44,235	$ 26,993
Earnings Per Share, Basic	$ 0.93	$ 0.58	$ 2.11	$ 1.28
Earnings Per Share, Diluted	$ 0.92	$ 0.58	$ 2.08	$ 1.26
Weighted Average Number of Shares Outstanding, Basic	20,829,165	20,728,149	20,780,975	20,819,857
Weighted Average Number of Shares Outstanding, Diluted	21,087,779	20,996,732	21,066,489	21,084,267

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment
Stockholders' Equity Attributable to Parent at Sep. 30, 2019	$ 246,248		$ 220	$ (12,483)	$ 192,911	$ 65,600
Shares, Issued at Sep. 30, 2019			22,049,529	884,518
Issuances under compensation plans				$ (1,683)	(1,683)
Issuances under compensation plans, shares				118,633
Acquisition of treasury stock	(5,437)			$ (5,437)	0
Acquisition of treasury stock, shares				(242,386)
Options exercised	34			$ 84	50
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised				5,750
Non-cash compensation	2,843				2,843
Noncontrolling Interest, Change in Redemption Value	0
Net income (loss) attributable to IES Holdings, Inc.	26,993					26,993
Stockholders' Equity Attributable to Parent at Jun. 30, 2020	270,681		$ 220	$ (16,153)	194,021	92,593
Shares, Issued at Jun. 30, 2020			22,049,529	1,002,521
Stockholders' Equity Attributable to Parent at Mar. 31, 2020	257,805		$ 220	$ (15,643)	192,895	80,333
Shares, Issued at Mar. 31, 2020			22,049,529	977,863
Issuances under compensation plans				$ (33)	(33)
Issuances under compensation plans, shares				2,053
Acquisition of treasury stock	(543)			$ (543)	0
Acquisition of treasury stock, shares				(26,711)
Non-cash compensation	1,159				1,159
Noncontrolling Interest, Change in Redemption Value	0
Net income (loss) attributable to IES Holdings, Inc.	12,260					12,260
Stockholders' Equity Attributable to Parent at Jun. 30, 2020	270,681		$ 220	$ (16,153)	194,021	92,593
Shares, Issued at Jun. 30, 2020			22,049,529	1,002,521
Stockholders' Equity Attributable to Parent at Sep. 30, 2020	283,313		$ 220	$ (24,499)	200,587	107,005
Shares, Issued at Sep. 30, 2020			22,049,529	1,287,134
Issuances under compensation plans				$ (2,737)	(2,737)
Issuances under compensation plans, shares				140,660
Acquisition of treasury stock	(1,490)			$ (2,021)	531
Acquisition of treasury stock, shares				(46,319)
Non-cash compensation	2,745				2,745
Noncontrolling Interest, Change in Redemption Value	(400)					(400)
Net income (loss) attributable to IES Holdings, Inc.	44,235					44,235
Stockholders' Equity Attributable to Parent at Jun. 30, 2021	328,189	$ (214)	$ 220	$ (23,783)	201,126	150,626	$ (214)
Shares, Issued at Jun. 30, 2021			22,049,529	1,192,793
Stockholders' Equity Attributable to Parent at Mar. 31, 2021	308,535		$ 220	$ (23,639)	200,732	131,222
Shares, Issued at Mar. 31, 2021			22,049,529	1,210,685
Issuances under compensation plans				$ (651)	(651)
Issuances under compensation plans, shares				33,333
Acquisition of treasury stock	(795)			$ (795)	0
Acquisition of treasury stock, shares				(15,441)
Non-cash compensation	1,045				1,045
Noncontrolling Interest, Change in Redemption Value	103					103
Net income (loss) attributable to IES Holdings, Inc.	19,301					19,301
Stockholders' Equity Attributable to Parent at Jun. 30, 2021	$ 328,189	$ (214)	$ 220	$ (23,783)	$ 201,126	$ 150,626	$ (214)
Shares, Issued at Jun. 30, 2021			22,049,529	1,192,793

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Net income (loss)	$ 45,202	$ 27,073
Bad debt expense	37	1,668
Deferred financing cost amortization	145	314
Depreciation and amortization	15,910	8,797
Loss (gain) on sale of assets	(24)	(40)
Non-cash compensation expense	2,745	2,843
Deferred income taxes	6,841	5,031
Accounts receivable	(10,686)	(2,007)
Inventories	(33,761)	(3,275)
Costs and estimated earnings in excess of billings	(2,025)	4,551
Prepaid expenses and other current assets	(6,062)	(8,783)
Other non-current assets	(275)	520
Accounts payable and accrued expenses	3,964	156
Billings in excess of costs and estimated earnings	11,496	14,402
Other non-current liabilities	1,642	4,345
Net cash provided by operating activities	35,149	55,595
Purchases of property and equipment	(5,391)	(3,700)
Proceeds from sale of assets	166	60
Cash paid in conjunction with business combinations	(92,694)	(28,952)
Net cash used in investing activities	(97,919)	(32,592)
Borrowings of debt	947,057	592,648
Repayments of debt	(915,928)	(592,643)
Cash paid for finance leases	(423)	(132)
Payments for Repurchase of Redeemable Noncontrolling Interest	(1,188)
Distribution to noncontrolling interest	(311)	(577)
Purchase of treasury stock	(1,490)	(5,437)
Net cash used in financing activities	27,717	(6,107)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(35,053)	16,896
CASH, CASH EQUIVALENTS, beginning of period		18,934
CASH, CASH EQUIVALENTS, end of period	18,524	35,830
Cash paid for interest	460	668
Cash paid for income taxes (net)	3,473	718
Options exercised	$ 0	$ 34

Business

Business	9 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Business Description and Basis of Presentation [Text Block]	1. BUSINESS AND ACCOUNTING POLICIES Description of the Business IES Holdings, Inc. is a holding company that owns and manages operating subsidiaries that design and install integrated electrical and technology systems and provide infrastructure products and services across a variety of end-markets, including data centers, residential housing and commercial and industrial facilities. Our operations are organized into the following four principal business segments, based upon the nature of our services: • Communications – Nationwide provider of technology infrastructure services, including the design, build, and maintenance of the communications infrastructure within data centers for co-location and managed hosting customers, for both large corporations and independent businesses. • Residential – Regional provider of electrical installation services for single-family housing and multi-family apartment complexes. • Infrastructure Solutions – Provider of electro-mechanical solutions for industrial operations, including apparatus repair and custom-engineered products, such as generator enclosures, to be used in data centers and other industrial applications. • Commercial & Industrial – Provider of electrical and mechanical design, construction, and maintenance services to the commercial and industrial markets in various regional markets and nationwide in certain areas of expertise, such as the power infrastructure market and data centers. The words “IES”, the “Company”, “we”, “our”, and “us” refer to IES Holdings, Inc. and, except as otherwise specified herein, to our consolidated subsidiaries. Seasonality and Quarterly Fluctuations Results of operations from our Residential segment can be seasonal, depending on weather trends, with typically higher revenues generated during spring and summer and lower revenues generated during fall and winter. The Commercial & Industrial, Communications and Infrastructure Solutions segments of our business are less subject to seasonal trends, as work in these segments generally is performed inside structures protected from the weather, although weather can still impact these businesses, especially in the early stages of projects. From quarter to quarter, results for our Communications, Residential, and Commercial & Industrial segments may be materially affected by the timing of new construction projects, and our volume of business may be adversely affected by declines in construction projects resulting from adverse regional or national economic conditions. Quarterly results for our Infrastructure Solutions segment may be affected by the timing of outages or capital projects at our customers’ facilities. Accordingly, operating results for any fiscal period are not necessarily indicative of results that may be achieved for any subsequent fiscal period. Basis of Financial Statement Preparation The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of IES, our wholly-owned subsidiaries, and entities that we control due to ownership of a majority of voting interest and have been prepared in accordance with the instructions to interim financial reporting as prescribed by the United States Securities and Exchange Commission (the “SEC”). The results for the interim periods are not necessarily indicative of results for the entire year. These interim financial statements do not include all disclosures required by U.S. generally accepted accounting principles (“GAAP”), and should be read in conjunction with the consolidated financial statements and notes thereto filed with the SEC in our Annual Report on Form 10-K for the fiscal year ended September 30, 2020. In the opinion of management, the unaudited Condensed Consolidated Financial Statements contained in this report include all known accruals and adjustments necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods reported herein. Any such adjustments are of a normal recurring nature. Noncontrolling Interest In connection with our acquisitions of Edmonson Electric, LLC and Bayonet Plumbing, Heating & Air-Conditioning, LLC ("Bayonet") in fiscal 2021, NEXT Electric, LLC in fiscal 2017, and STR Mechanical, LLC in fiscal 2016, we acquired an 80 percent interest in each of the entities, with the remaining 20 percent interest in each such entity being retained by the respective third party seller. The interests retained by those third party sellers are identified on our Condensed Consolidated Balance Sheets as noncontrolling interest, classified outside of permanent equity. Under the terms of each entity’s operating agreement, after five years from the date of the acquisition, we may elect to purchase, or the third party seller may require us to purchase, part or all of the remaining 20 percent interest in the applicable entity. The purchase price is variable, based on a multiple of earnings as defined in the operating agreements. Therefore, this noncontrolling interest is carried at the greater of the balance determined under Accounting Standards Codification (“ASC”) 810 and the redemption amounts assuming the noncontrolling interests were redeemable at the balance sheet date. During the quarter ended June 30, 2021, we acquired the noncontrolling interest in STR Mechanical, LLC for $1,188. If all of the noncontrolling interests remaining outstanding at June 30, 2021 had been redeemable at that date, the redemption amount would have been $17,355. During the three and nine months ended June 30, 2021, we recorded valuation adjustments to the balance sheet carrying value of noncontrolling interest of a $103 decrease and $400 increase, respectively. Use of Estimates The preparation of financial statements in conformity with GAAP requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities, disclosures of contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates are primarily used in our revenue recognition of construction in progress, fair value assumptions in accounting for business combinations and analyzing goodwill, investments, intangible assets and long-lived asset impairments and adjustments, allowance for credit losses, stock-based compensation, reserves for legal matters, realizability of deferred tax assets, unrecognized tax benefits and self-insured claims liabilities and related reserves. Accounting Standards Recently Adopted In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2016-13, Financial Instruments – Credit Losses (“ASU 2016-13”), which requires companies to consider historical experiences, current market conditions and reasonable and supportable forecasts in the measurement of expected credit losses, with further clarifications made in April 2019 and May 2019 with the issuances of Accounting Standard Updates No. 2019-04 and 2019-05. This update is effective for fiscal years beginning after December 15, 2019 and for interim periods within those fiscal years. We adopted this standard on October 1, 2020, using a modified retrospective transition method through a cumulative-effect adjustment to beginning retained earnings in the period of adoption. As a result, we recorded an increase in the Allowance for Credit Losses of $284, an increase to Deferred Tax Assets of $70, and an increase of $214 to retained earnings. ASU 2016-13 requires the recognition of expected credit losses on financial assets measured at amortized cost basis. In calculating our expected credit losses, we considered trade receivables, retainage, and costs and estimated earnings in excess of billings, all of which constitute a homogenous portfolio, and therefore, to measure the expected credit loss, they have been grouped together. We have elected to calculate an expected credit loss based on loss rates from historical data. Each segment groups financial assets with similar risk characteristics and collectively assesses the expected credit losses. If an individual asset experiences credit deterioration to the extent the credit risk is no longer characteristic of the other assets in the group, it will be analyzed individually. The loss rates for our portfolios include our history of credit loss expense, the aging of our receivables, our expectation of payments and adjustment for forward-looking factors specific to the macroeconomic trends in the U.S. construction market. Other than trade receivables due in one year or less, we do not have any other financial assets that are past due or are on non-accrual status. In August 2018, the FASB issued Accounting Standard Update No. 2018-13, Fair Value Measurement Disclosure Framework (“ASU 2018-13”), to modify certain disclosure requirements for fair value measurements. Under the new guidance, registrants will need to disclose weighted average information for significant unobservable inputs for all Level 3 fair value measurements. The guidance does not specify how entities should calculate the weighted average, but requires them to explain their calculation. The new guidance also requires disclosing the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements of instruments held at the end of the reporting period. This guidance is effective for fiscal years beginning after December 15, 2019 and for interim periods within those fiscal years. We adopted this standard on October 1, 2020, with no impact on our Condensed Consolidated Financial Statements. Accounting Standards Not Yet Adopted In December 2019, the FASB issued Accounting Standard Update No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” This standard simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in Topic 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The standard also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. This update is effective for fiscal years beginning after December 15, 2020 and for interim periods within that year. Early adoption is permitted. We expect to adopt this standard on October 1, 2021, and do not expect it to have a material impact on our Condensed Consolidated Financial Statements.

Controlling Shareholder

Controlling Shareholder	9 Months Ended
	Jun. 30, 2021
Risks and Uncertainties [Abstract]
Controlling Shareholder [Text Block]	2. CONTROLLING STOCKHOLDER Tontine Associates, L.L.C. ("Tontine Associates"), together with its affiliates (collectively, “Tontine”), is the Company’s controlling stockholder, owning approximately 56 percent of the Company’s outstanding common stock according to a Form 4 filed by Tontine with the SEC on June 9, 2021. Accordingly, Tontine has the ability to exercise significant control over our affairs, including the election of directors and most actions requiring the approval of stockholders. While Tontine is subject to certain restrictions under federal securities laws on sales of its shares as an affiliate, the Company has filed a shelf registration statement to register all of the shares of IES common stock owned by Tontine at the time of registration. As long as the shelf registration statement remains effective and the Company remains eligible to use it, Tontine has the ability to resell any or all of its registered shares from time to time in one or more offerings, as described in the shelf registration statement and in any prospectus supplement filed in connection with an offering pursuant to the shelf registration statement. Should Tontine sell or otherwise dispose of all or a portion of its position in IES, a change in ownership of IES could occur. A change in ownership, as defined by Internal Revenue Code Section 382, could reduce the availability of the Company’s net operating losses (“NOLs”) for federal and state income tax purposes. Furthermore, a change of control would trigger the change of control provisions in a number of our material agreements, including our credit agreement, bonding agreements with our sureties and our executive severance plan. The Company previously had in place a tax benefit protection plan (the “NOL Rights Plan”), designed to deter an acquisition of the Company's stock in excess of a threshold amount that could trigger a change in ownership within the meaning of Internal Revenue Code Section 382. However, on May 7, 2021, we amended the NOL Rights Plan, accelerating the expiration of the plan from December 31, 2021 to May 21, 2021. As a result of this amendment, the NOL Rights Plan has now expired. Jeffrey L. Gendell was appointed as Chief Executive Officer of the Company effective October 1, 2020, having served as the Company's Interim Chief Executive Officer since July 31, 2020. Mr. Gendell also serves as Chairman of the Company's Board of Directors (the "Board"), a position he has held since November 2016. He is the managing member and founder of Tontine, and the brother of David B. Gendell, who has served as a member of our Board since February 2012, and who previously served as Interim Director of Operations from November 2017 to January 2019, as Vice Chairman of the Board from November 2016 to November 2017 and as Chairman of the Board from January 2015 to November 2016. David B. Gendell was an employee of Tontine from 2004 until December 31, 2017. The Company is party to a sublease agreement with Tontine Associates for corporate office space in Greenwich, Connecticut. The sublease extends through February 27, 2023, with monthly payments due in the amount of approximately $8. Payments by the Company are at a rate consistent with that paid by Tontine Associates to its landlord. On December 6, 2018, the Company entered into a Board Observer Letter Agreement (the "Observer Agreement") with Tontine Associates in order to assist Tontine in managing its investment in the Company. Subject to the terms and conditions set forth in the Observer Agreement, the Company granted Tontine the right, at any time that Tontine holds at least 20% of the outstanding common stock of the Company, to appoint a representative to serve as an observer to the Board (the “Board Observer”). The Board Observer, who must be reasonably acceptable to those members of the Board who are not affiliates of Tontine, shall have no voting rights or other decision making authority. Subject to the terms and conditions set forth in the Observer Agreement, so long as Tontine has the right to appoint a Board Observer, the Board Observer will have the right to attend and participate in meetings of the Board and the committees thereof, subject to confidentiality requirements, and to receive reimbursement for reasonable out-of-pocket expenses incurred in his or her capacity as a Board Observer and such rights to coverage under the Company’s directors’ and officers’ liability insurance policy as are available to the Company’s directors.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Jun. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract]
Revenue from External Customers by Products and Services [Table Text Block]	3. REVENUE RECOGNITION Contracts Our revenue is derived from contracts with customers, and we determine the appropriate accounting treatment for each contract at its inception. Our contracts primarily relate to electrical and mechanical contracting services, technology infrastructure products and services, and electro-mechanical solutions for industrial operations. Revenue is earned based upon an agreed fixed price or actual costs incurred plus an agreed upon percentage. We account for a contract when: (i) it has approval and commitment from both parties, (ii) the rights of the parties are identified, (iii) payment terms are identified, (iv) the contract has commercial substance, and (v) collectability of consideration is probable. We consider the start of a project to be when the above criteria have been met and we have written authorization from the customer to proceed. Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. We recognize revenue over time for the majority of the services we perform as (i) control continuously transfers to the customer as work progresses at a project location controlled by the customer and (ii) we have the right to bill the customer as costs are incurred. Within our Infrastructure Solutions segment, we often perform work inside our own facilities, where control does not continuously transfer to the customer as work progresses. In such cases, we evaluate whether we have the right to bill the customer as costs are incurred. Such assessment involves an evaluation of contractual termination clauses. Where we have a contractual right to payment for work performed to date, we recognize revenue over time. If we do not have such a right, we recognize revenue upon completion of the contract, when control of the work transfers to the customer. For fixed price arrangements, we use the percentage of completion method of accounting under which revenue recognized is measured principally by the costs incurred and accrued to date for each contract as a percentage of the estimated total cost for each contract at completion. Contract costs include all direct material, labor and indirect costs related to contract performance. Changes in job performance, job conditions, estimated contract costs and profitability and final contract settlements may result in revisions to costs and income, and the effects of these revisions are recognized in the period in which the revisions are determined. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. This measurement and comparison process requires updates to the estimate of total costs to complete the contract, and these updates may include subjective assessments and judgments. Variable Consideration The transaction price for our contracts may include variable consideration, which includes changes to transaction price for approved and unapproved change orders, claims and incentives. Change orders, claims, and incentives are generally not distinct from the existing contract due to the significant integration service provided in the context of the contract and are accounted for as a modification of the existing contract and performance obligation. We estimate variable consideration for a performance obligation at the probability weighted value we expect to receive (or the most probable amount we expect to incur in the case of liquidated damages, if any), utilizing estimation methods that best predict the amount of consideration to which we will be entitled (or will be incurred in the case of liquidated damages, if any). We include variable consideration in the estimated transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur or when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in transaction price are based largely on an assessment of our anticipated performance and all information (historical, current and forecasted) that is reasonably available to us. The effect of variable consideration on the transaction price of a performance obligation is recognized as an adjustment to revenue on a cumulative catch-up basis. To the extent unapproved change orders and claims reflected in transaction price (or accounted for as a reduction of the transaction price in the case of liquidated damages) are not resolved in our favor, or to the extent incentives reflected in transaction price are not earned, there could be reductions in, or reversals of, previously recognized revenue. Costs of Obtaining a Contract In certain of our operations, we incur commission costs related to entering into a contract that we only incurred because of that contract. When this occurs, we capitalize that cost and amortize it over the expected term of the contract. At June 30, 2021, we had capitalized commission costs of $100. We generally do not incur significant incremental costs related to obtaining or fulfilling a contract prior to the start of a project. When significant pre-contract costs are incurred, they will be capitalized and amortized on a percentage of completion basis over the life of the contract. Disaggregation of Revenue We disaggregate our revenue from contracts with customers by activity and contract type, as these categories reflect how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Our consolidated revenue for the three and nine months ended June 30, 2021 and 2020 was derived from the following activities. See details in the following tables: Three Months Ended June 30, Nine Months Ended June 30, 2021 2020 2021 2020 Communications $ 116,218 $ 96,500 $ 309,460 $ 276,779 Residential Single-family 102,105 62,239 274,707 176,071 Multi-family and Other 84,344 45,666 181,569 124,589 Total Residential 186,449 107,905 456,276 300,660 Infrastructure Solutions Industrial Services 11,972 9,753 32,560 31,588 Custom Power Solutions 27,145 22,189 75,674 60,937 Total Infrastructure Solutions 39,117 31,942 108,234 92,525 Commercial & Industrial 64,087 56,778 178,700 190,481 Total Revenue $ 405,871 $ 293,125 $ 1,052,670 $ 860,445 Three Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 81,521 $ 186,449 $ 37,241 $ 60,444 $ 365,655 Time-and-material 34,697 — 1,876 3,643 40,216 Total revenue $ 116,218 $ 186,449 $ 39,117 $ 64,087 $ 405,871 Three Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 79,801 $ 107,905 $ 30,504 $ 53,811 $ 272,021 Time-and-material 16,699 — 1,438 2,967 21,104 Total revenue $ 96,500 $ 107,905 $ 31,942 $ 56,778 $ 293,125 Nine Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 226,086 $ 456,276 $ 102,864 $ 170,134 $ 955,360 Time-and-material 83,374 — 5,370 8,566 97,310 Total revenue $ 309,460 $ 456,276 $ 108,234 $ 178,700 $ 1,052,670 Nine Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 213,205 $ 300,660 $ 87,479 $ 180,425 $ 781,769 Time-and-material 63,574 — 5,046 10,056 78,676 Total revenue $ 276,779 $ 300,660 $ 92,525 $ 190,481 $ 860,445 Accounts Receivable Accounts receivable include amounts which we have billed or have an unconditional right to bill our customers. As of June 30, 2021, Accounts receivable included $18,525 of unbilled receivables for which we have an unconditional right to bill. Contract Assets and Liabilities Project contracts typically provide for a schedule of billings on percentage of completion of specific tasks inherent in the fulfillment of our performance obligation(s). The schedules for such billings usually do not precisely match the schedule on which costs are incurred. As a result, contract revenue recognized in the statement of operations can, and usually does, differ from amounts that can be billed to the customer at any point during the contract. Amounts by which cumulative contract revenue recognized on a contract as of a given date exceeds cumulative billings and unbilled receivables to the customer under the contract are reflected as a current asset in our Condensed Consolidated Balance Sheet under the caption “Costs and estimated earnings in excess of billings”. Amounts by which cumulative billings to the customer under a contract as of a given date exceed cumulative contract revenue recognized are reflected as a current liability in our Condensed Consolidated Balance Sheet under the caption “Billings in excess of costs and estimated earnings”. During the three months ended June 30, 2021 and 2020, we recognized revenue of $25,851 and $19,661 related to our contract liabilities at April 1, 2021 and 2020, respectively. During the nine months ended June 30, 2021 and 2020, we recognized revenue of $41,121 and $29,692 related to our contract liabilities at October 1, 2020 and 2019, respectively. We did not have any impairment losses recognized on our receivables or contract assets for the three and nine months ended June 30, 2021 or 2020. Remaining Performance Obligations Remaining performance obligations represent the unrecognized revenue value of our contract commitments. New awards represent the total expected revenue value of new contract commitments undertaken during a given period, as well as additions to the scope of existing contract commitments. Our new performance obligations vary significantly each reporting period based on the timing of our major new contract commitments. At June 30, 2021, we had remaining performance obligations of $668,716. The Company expects to recognize revenue on approximately $555,454 of the remaining performance obligations over the next 12 months, with the remaining recognized thereafter. For the three and nine months ended June 30, 2021, net revenue recognized from our performance obligations satisfied in previous periods was not material.

Debt

Debt	9 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	4. DEBT At June 30, 2021 and September 30, 2020, we had $30,479 and $12, respectively, in borrowings outstanding under our revolving credit facility with Wells Fargo Bank, N.A. ("Wells Fargo"), and long-term debt related to loans on capital expenditures of $97 and $205, respectively. At June 30, 2021, we also had $4,527 in outstanding letters of credit and total availability of $64,331 under our revolving credit facility without triggering our financial covenants under the Amended Credit Agreement (as defined below). The Company maintains a $100 million revolving credit facility that matures on September 30, 2024, pursuant to our Second Amended and Restated Credit and Security Agreement with Wells Fargo (as amended, the “Amended Credit Agreement”). The Amended Credit Agreement contains customary affirmative, negative and financial covenants as disclosed in Item 7 of our Annual Report on Form 10-K for the year ended September 30, 2020. As of June 30, 2021, the Company was in compliance with the financial covenants under the Amended Credit Agreement.

Per Share Information

Per Share Information	9 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	5. PER SHARE INFORMATION The following tables reconcile the components of basic and diluted earnings per share for the three and nine months ended June 30, 2021 and 2020: Three Months Ended June 30, 2021 2020 Numerator: Net income attributable to common stockholders of IES Holdings, Inc. $ 19,388 $ 12,066 Increase (decrease) in noncontrolling interest (103) — Net income attributable to restricted stockholders of IES Holdings, Inc. 16 194 Net income attributable to IES Holdings, Inc. $ 19,301 $ 12,260 Denominator: Weighted average common shares outstanding — basic 20,829,165 20,728,149 Effect of dilutive stock options and non-vested securities 258,614 268,583 Weighted average common and common equivalent shares outstanding — diluted 21,087,779 20,996,732 Earnings per share attributable to common stockholders of IES Holdings, Inc.: Basic $ 0.93 $ 0.58 Diluted $ 0.92 $ 0.58 Nine Months Ended June 30, 2021 2020 Numerator: Net income attributable to common stockholders of IES Holdings, Inc. $ 43,797 $ 26,577 Increase in noncontrolling interest 400 — Net income attributable to restricted stockholders of IES Holdings, Inc. 38 416 Net income attributable to IES Holdings, Inc. $ 44,235 $ 26,993 Denominator: Weighted average common shares outstanding — basic 20,780,975 20,819,857 Effect of dilutive stock options and non-vested securities 285,514 264,410 Weighted average common and common equivalent shares outstanding — diluted 21,066,489 21,084,267 Earnings per share attributable to common stockholders of IES Holdings, Inc.: Basic $ 2.11 $ 1.28 Diluted $ 2.08 $ 1.26 For the three and nine months ended June 30, 2021 and 2020, the average price of our common shares exceeded the exercise price of all of our outstanding options; therefore, all of our outstanding stock options were included in the computation of fully diluted earnings per share.

Operating Segments

Operating Segments	9 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	6. OPERATING SEGMENTS We manage and measure performance of our business in four distinct operating segments: Communications, Residential, Infrastructure Solutions, and Commercial & Industrial. These segments are reflective of how the Company’s Chief Operating Decision Maker (“CODM”) reviews operating results for the purpose of allocating resources and assessing performance. The Company’s CODM is its Chief Executive Officer. Transactions between segments, if any, are eliminated in consolidation. Our corporate office provides general and administrative services, as well as support services, to each of our four operating segments. Management allocates certain shared costs between segments for selling, general and administrative expenses and depreciation expense. Segment information for the three and nine months ended June 30, 2021 and 2020 is as follows: Three Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 116,218 $ 186,449 $ 39,117 $ 64,087 $ — $ 405,871 Cost of services 95,582 152,778 28,374 56,308 — 333,042 Gross profit 20,636 33,671 10,743 7,779 — 72,829 Selling, general and administrative 10,783 22,634 5,961 6,781 4,183 50,342 Contingent consideration — 69 — — — 69 Loss (gain) on sale of assets (7) 8 (1) (32) — (32) Operating income (loss) $ 9,860 $ 10,960 $ 4,783 $ 1,030 $ (4,183) $ 22,450 Other data: Depreciation and amortization expense $ 341 $ 3,456 $ 1,553 $ 673 $ 39 $ 6,062 Capital expenditures $ 187 $ 641 $ 1,034 $ 525 $ — $ 2,387 Total assets $ 141,004 $ 308,411 $ 136,741 $ 76,278 $ 53,496 $ 715,930 Three Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 96,500 $ 107,905 $ 31,942 $ 56,778 $ — $ 293,125 Cost of services 77,792 82,192 22,609 52,212 — 234,805 Gross profit 18,708 25,713 9,333 4,566 — 58,320 Selling, general and administrative 9,316 16,767 5,512 8,786 3,880 44,261 Loss (gain) on sale of assets — — 3 (6) — (3) Operating income (loss) $ 9,392 $ 8,946 $ 3,818 $ (4,214) $ (3,880) $ 14,062 Other data: Depreciation and amortization expense $ 330 $ 476 $ 1,683 $ 692 $ 19 $ 3,200 Capital expenditures $ 63 $ 108 $ 135 $ 496 $ — $ 802 Total assets $ 131,796 $ 107,919 $ 126,557 $ 71,877 $ 87,176 $ 525,325 Nine Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 309,460 $ 456,276 $ 108,234 $ 178,700 $ — $ 1,052,670 Cost of services 250,738 368,887 76,999 159,664 — 856,288 Gross profit 58,722 87,389 31,235 19,036 — 196,382 Selling, general and administrative 29,739 61,570 17,787 19,949 11,738 140,783 Contingent consideration — 142 — — — 142 Loss (gain) on sale of assets (7) 60 (1) (49) (27) (24) Operating income (loss) $ 28,990 $ 25,617 $ 13,449 $ (864) $ (11,711) $ 55,481 Other data: Depreciation and amortization expense $ 1,035 $ 8,165 $ 4,548 $ 2,050 $ 112 $ 15,910 Capital expenditures $ 452 $ 2,118 $ 1,542 $ 1,190 $ 89 $ 5,391 Total assets $ 141,004 $ 308,411 $ 136,741 $ 76,278 $ 53,496 $ 715,930 Nine Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 276,779 $ 300,660 $ 92,525 $ 190,481 $ — $ 860,445 Cost of services 225,866 231,891 68,177 174,712 — 700,646 Gross profit 50,913 68,769 24,348 15,769 — 159,799 Selling, general and administrative 27,304 46,241 14,923 24,660 11,041 124,169 Loss (gain) on sale of assets (9) — 3 (34) — (40) Operating income (loss) $ 23,618 $ 22,528 $ 9,422 $ (8,857) $ (11,041) $ 35,670 Other data: Depreciation and amortization expense $ 1,010 $ 1,117 $ 4,557 $ 2,057 $ 56 $ 8,797 Capital expenditures $ 531 $ 977 $ 725 $ 1,168 $ 299 $ 3,700 Total assets $ 131,796 $ 107,919 $ 126,557 $ 71,877 $ 87,176 $ 525,325

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Shareholders' Equity and Share-based Payments [Text Block]	7. STOCKHOLDERS’ EQUITY Equity Incentive Plan The Company’s 2006 Equity Incentive Plan, as amended and restated (the “Equity Incentive Plan”), provides for grants of stock options as well as grants of stock, including restricted stock. Approximately 3.0 million shares of common stock are authorized for issuance under the Equity Incentive Plan, of which approximately 842,141 shares were available for issuance at June 30, 2021. Stock Repurchase Program In 2015, our Board authorized a stock repurchase program for the purchase from time to time of up to 1.5 million shares of the Company’s common stock, and on May 2, 2019, our Board authorized the repurchase from time to time of up to an additional 1.0 million shares of our common stock under the stock repurchase program. Share purchases are made for cash in open market transactions at prevailing market prices or in privately negotiated transactions or otherwise. The timing and amount of purchases under the program are determined based upon prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. All or part of the repurchases may be implemented under a Rule 10b5-1 trading plan, which allows repurchases under predetermined terms at times when the Company might otherwise be prevented from purchasing under insider trading laws or because of self-imposed blackout periods. The program does not require the Company to purchase any specific number of shares and may be modified, suspended or reinstated at any time at the Company’s discretion and without notice. We repurchased no shares of our common stock during the three and nine months ended June 30, 2021. We repurchased 26,711 and 224,959 shares, respectively, of our common stock during the three and nine months ended June 30, 2020 in open market transactions at an average price of $20.29 and $22.32 per share, respectively. Treasury Stock During the nine months ended June 30, 2021, we issued 71,420 shares of common stock from treasury stock to employees and repurchased 32,323 shares of common stock from our employees to satisfy statutory tax withholding requirements upon the vesting of certain performance phantom stock units under the Equity Incentive Plan. In addition, 13,996 restricted shares were forfeited by certain former employees upon their departure and returned to treasury stock. We also issued 380 unrestricted shares of common stock from treasury stock to members of our Board of Directors as part of their overall compensation, and we issued 68,860 shares from treasury stock to satisfy the vesting of Director PSUs (as defined below) in conjunction with the departure of a Board member. During the nine months ended June 30, 2020, we issued 113,408 shares of common stock from treasury stock to employees and repurchased 17,427 shares of common stock from our employees to satisfy statutory tax withholding requirements upon the vesting of certain performance phantom stock units under the Equity Incentive Plan. We also issued 5,225 unrestricted shares of common stock from treasury to members of our Board of Directors as part of their overall compensation and 5,750 unrestricted shares of common stock from treasury stock to satisfy the exercise of outstanding options. In addition, we repurchased 224,959 shares of common stock on the open market pursuant to our stock repurchase program. Restricted Stock We granted no restricted shares to executives during the nine months ended June 30, 2021. Of the awards previously granted, 8,183 shares vested and 13,996 shares were forfeited by certain former employees upon their departure. The remaining restricted shares either vest subject to the achievement of specified levels of cumulative net income before taxes or vest based on the passage of time. During the three months ended June 30, 2021 and 2020, we recognized $36 and $521, respectively, in compensation expense related to all restricted stock awards. During the nine months ended June 30, 2021 and 2020, we recognized $109 and $1,316, respectively, in compensation expense related to all restricted stock awards. At June 30, 2021, the unamortized compensation cost related to outstanding unvested restricted stock was $202. Director Phantom Stock Units Director phantom stock units (“Director PSUs”) are granted to the members of the Board of Directors as part of their overall compensation. The Director PSUs are contractual rights to receive one share of the Company's common stock and are paid via unrestricted stock grants to each director upon their departure from the Board of Directors, or upon a change in control. We record compensation expense for the full value of the grant on the date of grant. During the three months ended June 30, 2021 and 2020, we recognized $93 and $97, respectively, in compensation expense related to these grants. During the nine months ended June 30, 2021 and 2020, we recognized $280 and $293, respectively, in compensation expense related to these grants. Employee Phantom Stock Units An employee phantom stock unit (an “Employee PSU”) is a contractual right to receive one share of the Company’s common stock. Depending on the terms of each grant, Employee PSUs may vest upon the achievement of certain specified performance objectives and continued performance of services, or may vest based on continued performance of services through the vesting date. As of June 30, 2021, the Company had outstanding Employee PSUs, which, subject to the achievement of certain performance metrics, could result in the issuance of 258,253 shares of common stock. Of the Employee PSUs granted, 114,067 Employee PSUs have been forfeited, and 121,102 have vested. During the three months ended June 30, 2021 and 2020, we recognized $928 and $505, respectively, in compensation expense related to Employee PSU grants. During the nine months ended June 30, 2021 and 2020, we recognized $2,336 and $1,121, respectively, in compensation expense related to Employee PSU grants. In July 2021, we issued an additional 22,807 Employee PSUs.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Jun. 30, 2021
Retirement Benefits [Abstract]
Compensation and Employee Benefit Plans [Text Block]	8. 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 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 June 30, 2021 and 2020, we recognized $847 and $665, respectively, in matching expense. During the nine months ended June 30, 2021 and 2020, we recognized $2,326 and $1,747, 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 $585 and $719 recorded as of June 30, 2021 and September 30, 2020, respectively, related to such plans.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	9. FAIR VALUE MEASUREMENTS Fair Value Measurement Accounting Fair value is considered the price to sell an asset, or transfer a liability, between market participants on the measurement date. Fair value measurements assume that (1) the asset or liability is exchanged in an orderly manner, (2) the exchange is in the principal market for that asset or liability, and (3) the market participants are independent, knowledgeable, and able and willing to transact an exchange. Fair value accounting and reporting establishes a framework for measuring fair value by creating a hierarchy for observable independent market inputs and unobservable market assumptions and expands disclosures about fair value measurements. Considerable judgment is required to interpret the market data used to develop fair value estimates. As such, the estimates presented herein are not necessarily indicative of the amounts that could be realized in a current exchange. The use of different market assumptions and/or estimation methods could have a material effect on the estimated fair value. At June 30, 2021, financial assets and liabilities measured at fair value on a recurring basis were limited to our Executive Deferred Compensation Plan, under which certain employees are permitted to defer a portion of their base salary and/or bonus for a Plan Year (as defined in the plan), and contingent consideration liabilities related to certain of our acquisitions. Financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2021 and September 30, 2020, are summarized in the following tables by the type of inputs applicable to the fair value measurements: June 30, 2021 Total Fair Value Quoted Prices (Level 1) Significant Unobservable Inputs (Level 3) Executive savings plan assets $ 945 $ 945 $ — Executive savings plan liabilities (814) (814) — Contingent consideration liability (4,147) — (4,147) Total $ (4,016) $ 131 $ (4,147) September 30, 2020 Total Fair Value Quoted Prices (Level 1) Significant Unobservable Inputs (Level 3) Executive savings plan assets $ 766 $ 766 $ — Executive savings plan liabilities (644) (644) — Total $ 122 $ 122 $ — We entered into a contingent consideration arrangement related to the acquisition of Bayonet. At June 30, 2021, we estimated the fair value of this contingent consideration liability at $4,147. The table below presents the fair value of this obligation, which used significant unobservable inputs (Level 3). Contingent Consideration Agreements Fair value at September 30, 2020 $ — Acquisitions (4,074) Net adjustments to fair value (73) Fair value at June 30, 2021 $ (4,147)

Inventory

Inventory	9 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	10. INVENTORY Inventories consist of the following components: June 30, September 30, 2021 2020 Raw materials $ 5,264 $ 3,232 Work in process 5,928 4,894 Finished goods 1,537 1,186 Parts and supplies 58,833 15,577 Total inventories $ 71,562 $ 24,889

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	11. GOODWILL AND INTANGIBLE ASSETS Goodwill The following summarizes changes in the carrying value of goodwill by segment for the nine months ended June 30, 2021: Communications Residential Infrastructure Solutions Total Goodwill at September 30, 2020 $ 2,816 $ 16,219 $ 34,728 $ 53,763 Acquisitions — 34,902 3,362 38,264 Goodwill at June 30, 2021 $ 2,816 $ 51,121 $ 38,090 $ 92,027 Intangible Assets Intangible assets consist of the following: Estimated Useful Lives (in Years) June 30, 2021 Gross Carrying Amount Accumulated Amortization Net Trademarks/trade names 5 - 20 $ 15,394 $ (2,591) $ 12,803 Technical library 20 400 (156) 244 Customer relationships 6 - 15 96,879 (21,057) 75,822 Non-competition arrangements 5 40 (23) 17 Backlog and construction contracts 1 4,957 (4,542) 415 Total intangible assets $ 117,670 $ (28,369) $ 89,301 Estimated Useful Lives (in Years) September 30, 2020 Gross Carrying Amount Accumulated Amortization Net Trademarks/trade names 5 - 20 $ 7,754 $ (1,741) $ 6,013 Technical library 20 400 (141) 259 Customer relationships 6 - 15 46,449 (14,900) 31,549 Non-competition arrangements 5 40 (17) 23 Backlog and construction contracts 1 3,383 (1,870) 1,513 Total intangible assets $ 58,026 $ (18,669) $ 39,357

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	12. COMMITMENTS AND CONTINGENCIES Legal Matters From time to time we are a party to various claims, lawsuits and other legal proceedings that arise in the ordinary course of business. We maintain various insurance coverages to minimize financial risk associated with these proceedings. None of these proceedings, separately or in the aggregate, are expected to have a material adverse effect on our financial position, results of operations or cash flows. With respect to all such proceedings, we record reserves when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. We expense routine legal costs related to these proceedings as they are incurred. As of June 30, 2021, we did not have any material pending legal proceedings. Risk Management We retain the risk for workers’ compensation, employer’s liability, automobile liability, construction defects, general liability and employee group health claims, as well as pollution coverage, resulting from uninsured deductibles per accident or occurrence which are generally subject to annual aggregate limits. Our general liability program provides coverage for bodily injury and property damage. In many cases, we insure third parties, including general contractors, as additional insureds under our insurance policies. Losses are accrued based upon our known claims incurred and an estimate of claims incurred but not reported. As a result, many of our claims are effectively self-insured. Many claims against our insurance are in the form of litigation. At June 30, 2021 and September 30, 2020, we had $5,642 and $6,254, respectively, accrued for self-insurance liabilities. Because the reserves are based on judgment and estimates and involve variables that are inherently uncertain, such as the outcome of litigation and an assessment of insurance coverage, there can be no assurance that the ultimate liability will not be higher or lower than such estimates or that the timing of payments will not create liquidity issues for the Company. Some of the underwriters of our casualty insurance program require us to post letters of credit as collateral. This is common in the insurance industry. To date, we have not had a situation where an underwriter has had reasonable cause to effect payment under a letter of credit. At June 30, 2021 and September 30, 2020, $4,327 and $5,464, respectively, of our outstanding letters of credit were utilized to collateralize our insurance program. Surety As of June 30, 2021, the estimated cost to complete our bonded projects was approximately $98,342. We evaluate our bonding requirements on a regular basis, including the terms offered by our sureties. We believe the bonding capacity presently provided by our current sureties is adequate for our current operations and will be adequate for our operations for the foreseeable future. Other Commitments and Contingencies Some of our customers and vendors require us to post letters of credit, or provide intercompany guarantees, as a means of guaranteeing performance under our contracts and ensuring payment by us to subcontractors and vendors. If our customer has reasonable cause to effect payment under a letter of credit, we would be required to reimburse our creditor for the letter of credit. At each of June 30, 2021 and September 30, 2020, $200 of our outstanding letters of credit were to collateralize our vendors. Posting letters of credit in favor of our insurers, customers or vendors reduces the borrowing availability under our revolving credit facility.

Leases

Leases	9 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases of Lessee Disclosure	13. LEASES We enter into various contractual arrangements for the right to use facilities, vehicles and equipment. The lease term generally ranges from two to ten years for facilities and three to five years for vehicles and equipment. Our lease terms may reflect the exercise of renewal or termination options when it is reasonably certain these options will be exercised. Our lease agreements do not contain any material residual value guarantees or restrictive covenants. Current operating and finance liabilities of $13,668 and $832, respectively, as of June 30, 2021, and $11,056 and $418, respectively, as of September 30, 2020, were included in "Accounts payable and accrued expenses" in the Condensed Consolidated Balance Sheets. Non-current finance lease liabilities and finance lease right-of-use assets were included in the "Other non-current liabilities" and "Other non-current assets", respectively, in the Condensed Consolidated Balance Sheets. The maturities of our lease liabilities as of June 30, 2021 are as follows: Operating Leases Finance Leases Total Remainder of 2021 $ 7,263 $ 431 $ 7,694 2022 12,462 843 13,305 2023 8,534 831 9,365 2024 5,678 787 6,465 2025 4,152 503 4,655 Thereafter 9,245 63 9,308 Total undiscounted lease payments $ 47,334 $ 3,458 $ 50,792 Less: imputed interest 4,835 303 5,138 Present value of lease liabilities $ 42,499 $ 3,155 $ 45,654 The total future undiscounted cash flows related to lease agreements committed to but not yet commenced as of June 30, 2021 is $5,979. Lease cost recognized in our Condensed Consolidated Statements of Comprehensive Income is summarized as follows: Three Months Ended Nine Months Ended June 30, 2021 June 30, 2020 June 30, 2021 June 30, 2020 Operating lease cost $ 3,287 $ 2,967 $ 0 $ 10,337 $ 8,907 Finance lease cost Amortization of lease assets 176 64 418 124 Interest on lease liabilities 33 15 81 30 Finance lease cost 209 79 499 154 Short-term lease cost 330 327 880 802 Variable lease cost 321 190 954 618 Total lease cost $ 4,147 $ 3,563 $ 12,670 $ 10,481 Other information about lease amounts recognized in our Condensed Consolidated Financial Statements is summarized as follows: Three Months Ended Nine Months Ended June 30, 2021 June 30, 2020 June 30, 2021 June 30, 2020 Operating cash flows used for operating leases $ 3,401 $ 3,202 $ 11,051 $ 9,500 Operating cash flows used for finance leases 33 15 81 30 Right-of-use assets obtained in exchange for new operating lease liabilities 5,834 577 20,799 8,750 Right-of-use assets obtained in exchange for new finance lease liabilities 1,032 270 1,992 1,198 June 30, 2021 September 30, 2020 Weighted-average remaining lease term - operating leases 5.1 years 4.3 years Weighted-average remaining lease term - finance leases 4.3 years 4.4 years Weighted-average discount rate - operating leases 3.8 % 3.9 % Weighted-average discount rate - finance leases 4.5 % 5.1 %

Business Combinations and Dives

Business Combinations and Divestitures	9 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	14. BUSINESS COMBINATIONS AND DIVESTITURES Fiscal 2021 The Company completed the following four acquisitions during the nine months ended June 30, 2021: • Edmonson Electric, LLC ("Edmonson") - On May 18, 2021, we acquired an 80% ownership interest in Edmonson, a Land O'Lakes, Florida-based provider of residential electric, low voltage, and heating, ventilation and air conditioning (HVAC) installation services. The acquisition of Edmonson expands our presence in the Florida market and adds electrical to our Florida service offerings. Edmonson is part of our Residential segment and continues to operate under the Edmonson name. • Bayonet Plumbing, Heating & Air-Conditioning, LLC ("Bayonet") - On December 21, 2020, we acquired an 80% ownership interest in Bayonet, a Hudson, Florida-based provider of residential HVAC and plumbing installation and maintenance services. The acquisition of Bayonet allows us to expand into the Florida market, while adding plumbing and HVAC to our service offerings. Bayonet is part of our Residential segment and continues to operate under the Bayonet name. • Wedlake Fabricating, Inc. (“Wedlake”) - On November 19, 2020, we acquired Wedlake, a Tulsa, Oklahoma-based manufacturer of custom generator enclosures that are primarily used by data centers and large commercial and industrial facilities. The acquisition of Wedlake expands our generator enclosures business and our geographic footprint. Wedlake is part of our Infrastructure Solutions segment and continues to operate under the Wedlake name. • K.E.P. Electric, Inc. (“KEP”) - On November 5, 2020, we acquired KEP, a Batavia, Ohio-based electrical contractor specializing in the design and installation of electrical systems for single-family housing and multi-family developments. The acquisition of KEP, which has operations in Ohio and Kentucky, advances the expansion of our Residential service offerings into the Midwest. KEP is part of our Residential segment and continues to operate under the KEP name. Total aggregate cash consideration for these acquisitions was $92,694, of which $10,916 was paid into escrow pending discharge of the acquired companies' indebtedness under the Paycheck Protection Program ("PPP") established by the Coronavirus Aid, Relief, and Economic Security Act and implemented by the U.S. Small Business Administration. Loans made under the PPP are eligible to be forgiven if certain criteria are met. As of June 30, 2021, all PPP loans were forgiven and escrow payments have been distributed to the respective sellers. In addition to the cash consideration, the purchase price also includes contingent consideration with respect to the acquisition of Bayonet of up to $4,500 due in December 2023. Amounts to be paid are contingent on earnings achieved over a three year period, and will accrue interest on the $4,500 at a rate of 3%, to be paid quarterly. This contingent liability was valued at $4,074 as of the date of the acquisition. The Company accounted for the transactions under the acquisition method of accounting, which requires recording assets and liabilities at fair value (Level 3). The valuations derived from the estimated fair value assessments and assumptions used by management are preliminary pending finalization of certain tangible and intangible asset valuations and assessment of deferred taxes. While management believes the preliminary estimates and assumptions underlying the valuations are reasonable, different estimates and assumptions could result in different values being assigned to individual assets acquired and liabilities assumed. This may result in further adjustments to the preliminary amounts recorded. The preliminary valuation of the assets acquired and liabilities assumed is as follows: Current assets $ 36,256 Property and equipment 11,965 Intangible assets 59,695 Goodwill 38,264 Operating right of use assets 802 Current liabilities (29,212) Operating long-term lease liability (342) Deferred tax liability (3,168) Noncontrolling interest (21,566) Net assets acquired $ 92,694 With regard to goodwill, the balance is attributable to the workforce of the acquired businesses and other intangibles that do not qualify for separate recognition. In connection with these acquisitions, the preliminary estimate of acquired goodwill is $38,264 of which $24,611 is estimated to be tax deductible. The intangible assets acquired primarily consisted of Customer Relationships and Trade Names with a total weighted-average amortization period of 6.4 years. These acquisitions contributed $53,881 in revenue and $665 in operating income during the three months ended June 30, 2021. These acquisitions contributed $98,420 in revenue and $3,101 in operating income during the nine months ended June 30, 2021. Fiscal 2020 We completed two acquisitions in fiscal 2020 for total aggregate cash consideration of $28,952. We acquired both Aerial Lighting & Electric, Inc. ("Aerial") and Plant Power and Control Systems, L.L.C. ("PPCS") in February 2020. Unaudited Pro Forma Information The following unaudited supplemental pro forma results of operations for the three and nine months ended June 30, 2021 and 2020 are calculated as if each acquisition occurred as of October 1 of the fiscal year prior to consummation. Unaudited Three Months Ended June 30, Nine Months Ended June 30, 2021 2020 2021 2020 Revenues $ 419,553 $ 347,179 $ 1,147,234 $ 1,051,916 Net income attributable to IES Holdings, Inc. $ 19,709 $ 14,751 $ 47,288 $ 31,370

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Jun. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract]
Disaggregation of Revenue [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2021 2020 2021 2020 Communications $ 116,218 $ 96,500 $ 309,460 $ 276,779 Residential Single-family 102,105 62,239 274,707 176,071 Multi-family and Other 84,344 45,666 181,569 124,589 Total Residential 186,449 107,905 456,276 300,660 Infrastructure Solutions Industrial Services 11,972 9,753 32,560 31,588 Custom Power Solutions 27,145 22,189 75,674 60,937 Total Infrastructure Solutions 39,117 31,942 108,234 92,525 Commercial & Industrial 64,087 56,778 178,700 190,481 Total Revenue $ 405,871 $ 293,125 $ 1,052,670 $ 860,445 Three Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 81,521 $ 186,449 $ 37,241 $ 60,444 $ 365,655 Time-and-material 34,697 — 1,876 3,643 40,216 Total revenue $ 116,218 $ 186,449 $ 39,117 $ 64,087 $ 405,871 Three Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 79,801 $ 107,905 $ 30,504 $ 53,811 $ 272,021 Time-and-material 16,699 — 1,438 2,967 21,104 Total revenue $ 96,500 $ 107,905 $ 31,942 $ 56,778 $ 293,125 Nine Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 226,086 $ 456,276 $ 102,864 $ 170,134 $ 955,360 Time-and-material 83,374 — 5,370 8,566 97,310 Total revenue $ 309,460 $ 456,276 $ 108,234 $ 178,700 $ 1,052,670 Nine Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Total Fixed-price $ 213,205 $ 300,660 $ 87,479 $ 180,425 $ 781,769 Time-and-material 63,574 — 5,046 10,056 78,676 Total revenue $ 276,779 $ 300,660 $ 92,525 $ 190,481 $ 860,445

Per Share Information (Tables)

Per Share Information (Tables)	9 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended June 30, 2021 2020 Numerator: Net income attributable to common stockholders of IES Holdings, Inc. $ 19,388 $ 12,066 Increase (decrease) in noncontrolling interest (103) — Net income attributable to restricted stockholders of IES Holdings, Inc. 16 194 Net income attributable to IES Holdings, Inc. $ 19,301 $ 12,260 Denominator: Weighted average common shares outstanding — basic 20,829,165 20,728,149 Effect of dilutive stock options and non-vested securities 258,614 268,583 Weighted average common and common equivalent shares outstanding — diluted 21,087,779 20,996,732 Earnings per share attributable to common stockholders of IES Holdings, Inc.: Basic $ 0.93 $ 0.58 Diluted $ 0.92 $ 0.58 Nine Months Ended June 30, 2021 2020 Numerator: Net income attributable to common stockholders of IES Holdings, Inc. $ 43,797 $ 26,577 Increase in noncontrolling interest 400 — Net income attributable to restricted stockholders of IES Holdings, Inc. 38 416 Net income attributable to IES Holdings, Inc. $ 44,235 $ 26,993 Denominator: Weighted average common shares outstanding — basic 20,780,975 20,819,857 Effect of dilutive stock options and non-vested securities 285,514 264,410 Weighted average common and common equivalent shares outstanding — diluted 21,066,489 21,084,267 Earnings per share attributable to common stockholders of IES Holdings, Inc.: Basic $ 2.11 $ 1.28 Diluted $ 2.08 $ 1.26

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Three Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 116,218 $ 186,449 $ 39,117 $ 64,087 $ — $ 405,871 Cost of services 95,582 152,778 28,374 56,308 — 333,042 Gross profit 20,636 33,671 10,743 7,779 — 72,829 Selling, general and administrative 10,783 22,634 5,961 6,781 4,183 50,342 Contingent consideration — 69 — — — 69 Loss (gain) on sale of assets (7) 8 (1) (32) — (32) Operating income (loss) $ 9,860 $ 10,960 $ 4,783 $ 1,030 $ (4,183) $ 22,450 Other data: Depreciation and amortization expense $ 341 $ 3,456 $ 1,553 $ 673 $ 39 $ 6,062 Capital expenditures $ 187 $ 641 $ 1,034 $ 525 $ — $ 2,387 Total assets $ 141,004 $ 308,411 $ 136,741 $ 76,278 $ 53,496 $ 715,930 Three Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 96,500 $ 107,905 $ 31,942 $ 56,778 $ — $ 293,125 Cost of services 77,792 82,192 22,609 52,212 — 234,805 Gross profit 18,708 25,713 9,333 4,566 — 58,320 Selling, general and administrative 9,316 16,767 5,512 8,786 3,880 44,261 Loss (gain) on sale of assets — — 3 (6) — (3) Operating income (loss) $ 9,392 $ 8,946 $ 3,818 $ (4,214) $ (3,880) $ 14,062 Other data: Depreciation and amortization expense $ 330 $ 476 $ 1,683 $ 692 $ 19 $ 3,200 Capital expenditures $ 63 $ 108 $ 135 $ 496 $ — $ 802 Total assets $ 131,796 $ 107,919 $ 126,557 $ 71,877 $ 87,176 $ 525,325 Nine Months Ended June 30, 2021 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 309,460 $ 456,276 $ 108,234 $ 178,700 $ — $ 1,052,670 Cost of services 250,738 368,887 76,999 159,664 — 856,288 Gross profit 58,722 87,389 31,235 19,036 — 196,382 Selling, general and administrative 29,739 61,570 17,787 19,949 11,738 140,783 Contingent consideration — 142 — — — 142 Loss (gain) on sale of assets (7) 60 (1) (49) (27) (24) Operating income (loss) $ 28,990 $ 25,617 $ 13,449 $ (864) $ (11,711) $ 55,481 Other data: Depreciation and amortization expense $ 1,035 $ 8,165 $ 4,548 $ 2,050 $ 112 $ 15,910 Capital expenditures $ 452 $ 2,118 $ 1,542 $ 1,190 $ 89 $ 5,391 Total assets $ 141,004 $ 308,411 $ 136,741 $ 76,278 $ 53,496 $ 715,930 Nine Months Ended June 30, 2020 Communications Residential Infrastructure Solutions Commercial & Industrial Corporate Total Revenues $ 276,779 $ 300,660 $ 92,525 $ 190,481 $ — $ 860,445 Cost of services 225,866 231,891 68,177 174,712 — 700,646 Gross profit 50,913 68,769 24,348 15,769 — 159,799 Selling, general and administrative 27,304 46,241 14,923 24,660 11,041 124,169 Loss (gain) on sale of assets (9) — 3 (34) — (40) Operating income (loss) $ 23,618 $ 22,528 $ 9,422 $ (8,857) $ (11,041) $ 35,670 Other data: Depreciation and amortization expense $ 1,010 $ 1,117 $ 4,557 $ 2,057 $ 56 $ 8,797 Capital expenditures $ 531 $ 977 $ 725 $ 1,168 $ 299 $ 3,700 Total assets $ 131,796 $ 107,919 $ 126,557 $ 71,877 $ 87,176 $ 525,325

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	June 30, 2021 Total Fair Value Quoted Prices (Level 1) Significant Unobservable Inputs (Level 3) Executive savings plan assets $ 945 $ 945 $ — Executive savings plan liabilities (814) (814) — Contingent consideration liability (4,147) — (4,147) Total $ (4,016) $ 131 $ (4,147) September 30, 2020 Total Fair Value Quoted Prices (Level 1) Significant Unobservable Inputs (Level 3) Executive savings plan assets $ 766 $ 766 $ — Executive savings plan liabilities (644) (644) — Total $ 122 $ 122 $ —
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Contingent Consideration Agreements Fair value at September 30, 2020 $ — Acquisitions (4,074) Net adjustments to fair value (73) Fair value at June 30, 2021 $ (4,147)

Inventory (Tables)

Inventory (Tables)	9 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories consist of the following components: June 30, September 30, 2021 2020 Raw materials $ 5,264 $ 3,232 Work in process 5,928 4,894 Finished goods 1,537 1,186 Parts and supplies 58,833 15,577 Total inventories $ 71,562 $ 24,889

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	Communications Residential Infrastructure Solutions Total Goodwill at September 30, 2020 $ 2,816 $ 16,219 $ 34,728 $ 53,763 Acquisitions — 34,902 3,362 38,264 Goodwill at June 30, 2021 $ 2,816 $ 51,121 $ 38,090 $ 92,027
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Estimated Useful Lives (in Years) June 30, 2021 Gross Carrying Amount Accumulated Amortization Net Trademarks/trade names 5 - 20 $ 15,394 $ (2,591) $ 12,803 Technical library 20 400 (156) 244 Customer relationships 6 - 15 96,879 (21,057) 75,822 Non-competition arrangements 5 40 (23) 17 Backlog and construction contracts 1 4,957 (4,542) 415 Total intangible assets $ 117,670 $ (28,369) $ 89,301 Estimated Useful Lives (in Years) September 30, 2020 Gross Carrying Amount Accumulated Amortization Net Trademarks/trade names 5 - 20 $ 7,754 $ (1,741) $ 6,013 Technical library 20 400 (141) 259 Customer relationships 6 - 15 46,449 (14,900) 31,549 Non-competition arrangements 5 40 (17) 23 Backlog and construction contracts 1 3,383 (1,870) 1,513 Total intangible assets $ 58,026 $ (18,669) $ 39,357

Leases (Tables)

Leases (Tables)	9 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity	The maturities of our lease liabilities as of June 30, 2021 are as follows: Operating Leases Finance Leases Total Remainder of 2021 $ 7,263 $ 431 $ 7,694 2022 12,462 843 13,305 2023 8,534 831 9,365 2024 5,678 787 6,465 2025 4,152 503 4,655 Thereafter 9,245 63 9,308 Total undiscounted lease payments $ 47,334 $ 3,458 $ 50,792 Less: imputed interest 4,835 303 5,138 Present value of lease liabilities $ 42,499 $ 3,155 $ 45,654
Lease, Cost	Lease cost recognized in our Condensed Consolidated Statements of Comprehensive Income is summarized as follows: Three Months Ended Nine Months Ended June 30, 2021 June 30, 2020 June 30, 2021 June 30, 2020 Operating lease cost $ 3,287 $ 2,967 $ 0 $ 10,337 $ 8,907 Finance lease cost Amortization of lease assets 176 64 418 124 Interest on lease liabilities 33 15 81 30 Finance lease cost 209 79 499 154 Short-term lease cost 330 327 880 802 Variable lease cost 321 190 954 618 Total lease cost $ 4,147 $ 3,563 $ 12,670 $ 10,481
Schedule of Cash Flow, Supplemental Disclosures	Other information about lease amounts recognized in our Condensed Consolidated Financial Statements is summarized as follows: Three Months Ended Nine Months Ended June 30, 2021 June 30, 2020 June 30, 2021 June 30, 2020 Operating cash flows used for operating leases $ 3,401 $ 3,202 $ 11,051 $ 9,500 Operating cash flows used for finance leases 33 15 81 30 Right-of-use assets obtained in exchange for new operating lease liabilities 5,834 577 20,799 8,750 Right-of-use assets obtained in exchange for new finance lease liabilities 1,032 270 1,992 1,198 June 30, 2021 September 30, 2020 Weighted-average remaining lease term - operating leases 5.1 years 4.3 years Weighted-average remaining lease term - finance leases 4.3 years 4.4 years Weighted-average discount rate - operating leases 3.8 % 3.9 % Weighted-average discount rate - finance leases 4.5 % 5.1 %

Business Combinations and Div_2

Business Combinations and Divestitures (Tables)	9 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	Current assets $ 36,256 Property and equipment 11,965 Intangible assets 59,695 Goodwill 38,264 Operating right of use assets 802 Current liabilities (29,212) Operating long-term lease liability (342) Deferred tax liability (3,168) Noncontrolling interest (21,566) Net assets acquired $ 92,694
Business Acquisition, Pro Forma Information	Unaudited Three Months Ended June 30, Nine Months Ended June 30, 2021 2020 2021 2020 Revenues $ 419,553 $ 347,179 $ 1,147,234 $ 1,051,916 Net income attributable to IES Holdings, Inc. $ 19,709 $ 14,751 $ 47,288 $ 31,370

Business (Details)

Business (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Redeemable Noncontrolling Interest, Equity, Redemption Value	$ 17,355	$ 17,355
Increase (Decrease) in Deferred Income Taxes		70
Accounts Receivable, Allowance for Credit Loss, Current	1,278	1,278	$ 2,613
Payments for Repurchase of Redeemable Noncontrolling Interest	1,188	1,188
Payments for Repurchase of Redeemable Noncontrolling Interest	1,188	1,188
Accounting Standards Update 2016-13 [Member]
Accounts Receivable, Allowance for Credit Loss, Current	$ 284	$ 284

Controlling Shareholder (Detail

Controlling Shareholder (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2021USD ($)
Risks and Uncertainties [Abstract]
ControllingShareholderOwnershipPercentage	56.00%
Related Party Transaction, Purchases from Related Party	$ 8

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Revenue Recognition and Deferred Revenue [Abstract]
Capitalized Contract Cost, Net	$ 100		$ 100
Unbilled Receivables, Current	18,525		18,525
Costs and estimated earnings in excess of billings	31,962		31,962		$ 29,937
Billings in excess of costs and estimated earnings	(67,235)		(67,235)		$ (55,739)
Contract with Customer, Liability, Revenue Recognized	25,851	$ 19,661	41,121	$ 29,692
Performance Obligation Next 12 Months	555,454		555,454
Revenue, Remaining Performance Obligation, Amount	668,716		668,716
Disaggregation of Revenue [Line Items]
Revenues	405,871	293,125	1,052,670	860,445
Contract with Customer, Liability, Revenue Recognized	25,851	19,661	41,121	29,692
Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	64,087	56,778	178,700	190,481
Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	116,218	96,500	309,460	276,779
Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	39,117	31,942	108,234	92,525
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	186,449	107,905	456,276	300,660
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	365,655	272,021	955,360	781,769
Fixed-price Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	60,444	53,811	170,134	180,425
Fixed-price Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	81,521	79,801	226,086	213,205
Fixed-price Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	37,241	30,504	102,864	87,479
Fixed-price Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	186,449	107,905	456,276	300,660
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	40,216	21,104	97,310	78,676
Time-and-materials Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,643	2,967	8,566	10,056
Time-and-materials Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	34,697	16,699	83,374	63,574
Time-and-materials Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,876	1,438	5,370	5,046
Time-and-materials Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
industrial Services [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	11,972	9,753	32,560	31,588
Custom Power Solutions [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	27,145	22,189	75,674	60,937
Single Family Contracts [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	102,105	62,239	274,707	176,071
Multi Family and Other [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 84,344	$ 45,666	$ 181,569	$ 124,589

Debt (Details)

Debt (Details) - USD ($)	Jun. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Long-term debt	$ 30,576,000	$ 217,000
Letters of Credit Outstanding, Amount	4,527,000
Line of Credit Facility, Remaining Borrowing Capacity	64,331,000
Loans Payable to Bank, Noncurrent	30,479,000	12,000
Other Long-term Debt, Noncurrent	97,000	$ 205,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000

Per Share Information (Details)

Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 19,388	$ 12,066	$ 43,797	$ 26,577
Noncontrolling Interest, Change in Redemption Value	(103)	0	400	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	16	194	38	416
Comprehensive income attributable to IES Holdings, Inc.	$ 19,301	$ 12,260	$ 44,235	$ 26,993
Weighted Average Number of Shares Outstanding, Basic	20,829,165	20,728,149	20,780,975	20,819,857
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	258,614	268,583	285,514	264,410
Weighted Average Number of Shares Outstanding, Diluted	21,087,779	20,996,732	21,066,489	21,084,267
Earnings Per Share, Basic	$ 0.93	$ 0.58	$ 2.11	$ 1.28
Earnings Per Share, Diluted	$ 0.92	$ 0.58	$ 2.08	$ 1.26

Operating Segments (Details)

Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Segment Reporting Information [Line Items]
Cost of services	$ 333,042	$ 234,805	$ 856,288	$ 700,646
Gross profit	72,829	58,320	196,382	159,799
Selling, general and administrative expenses	50,342	44,261	140,783	124,169
Contingent consideration	69	0	142	0
Loss (gain) on sale of assets	(32)	(3)	(24)	(40)
Operating income (loss)	22,450	14,062	55,481	35,670
Depreciation and amortization expense	6,062	3,200	15,910	8,797
Capital expenditures	2,387	802	5,391	3,700
Total assets	715,930	525,325	715,930	525,325	$ 560,528
Revenues	405,871	293,125	1,052,670	860,445
Commercial and Industrial [Member]
Segment Reporting Information [Line Items]
Cost of services	56,308	52,212	159,664	174,712
Gross profit	7,779	4,566	19,036	15,769
Selling, general and administrative expenses	6,781	8,786	19,949	24,660
Loss (gain) on sale of assets	(32)	(6)	(49)	(34)
Operating income (loss)	1,030	(4,214)	(864)	(8,857)
Depreciation and amortization expense	673	692	2,050	2,057
Capital expenditures	525	496	1,190	1,168
Total assets	76,278	71,877	76,278	71,877
Revenues	64,087	56,778	178,700	190,481
Communications [Member]
Segment Reporting Information [Line Items]
Cost of services	95,582	77,792	250,738	225,866
Gross profit	20,636	18,708	58,722	50,913
Selling, general and administrative expenses	10,783	9,316	29,739	27,304
Loss (gain) on sale of assets	(7)	0	(7)	(9)
Operating income (loss)	9,860	9,392	28,990	23,618
Depreciation and amortization expense	341	330	1,035	1,010
Capital expenditures	187	63	452	531
Total assets	141,004	131,796	141,004	131,796
Revenues	116,218	96,500	309,460	276,779
Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Cost of services	28,374	22,609	76,999	68,177
Gross profit	10,743	9,333	31,235	24,348
Selling, general and administrative expenses	5,961	5,512	17,787	14,923
Loss (gain) on sale of assets	(1)	3	(1)	3
Operating income (loss)	4,783	3,818	13,449	9,422
Depreciation and amortization expense	1,553	1,683	4,548	4,557
Capital expenditures	1,034	135	1,542	725
Total assets	136,741	126,557	136,741	126,557
Revenues	39,117	31,942	108,234	92,525
Residential [Member]
Segment Reporting Information [Line Items]
Cost of services	152,778	82,192	368,887	231,891
Gross profit	33,671	25,713	87,389	68,769
Selling, general and administrative expenses	22,634	16,767	61,570	46,241
Contingent consideration	69		142
Loss (gain) on sale of assets	8	0	60	0
Operating income (loss)	10,960	8,946	25,617	22,528
Depreciation and amortization expense	3,456	476	8,165	1,117
Capital expenditures	641	108	2,118	977
Total assets	308,411	107,919	308,411	107,919
Revenues	186,449	107,905	456,276	300,660
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Cost of services	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	4,183	3,880	11,738	11,041
Loss (gain) on sale of assets	0	0	(27)	0
Operating income (loss)	(4,183)	(3,880)	(11,711)	(11,041)
Depreciation and amortization expense	39	19	112	56
Capital expenditures	0	0	89	299
Total assets	53,496	87,176	53,496	87,176
Revenues	$ 0	$ 0	$ 0	$ 0

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 31, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	May 02, 2019	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	100,000,000		100,000,000				100,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			8,183
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			0
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited			114,067
Shares, vested			121,102
Shares, Outstanding	258,253		258,253
Treasury Stock Acquired, Average Cost Per Share		$ 20.29		$ 22.32
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 202		$ 202
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			32,323	17,427
Common Stock, Capital Shares Reserved for Future Issuance	842,141		842,141
Stock Repurchase Program, Number of Shares Authorized to be Repurchased										1,000,000	1,500,000
Treasury Stock Acquired, Average Cost Per Share		$ 20.29		$ 22.32
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			32,323	17,427
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 202		$ 202
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period			13,996
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued					22,807
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	36	$ 521	$ 109	$ 1,316
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	93	97	280	293
Performance Based Phantom Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 928	$ 505	$ 2,336	$ 1,121
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	15,441	26,711	46,319	242,386
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			71,420	113,408
Shares, Issued	1,192,793	1,002,521	1,192,793	1,002,521		1,210,685	1,287,134	977,863	884,518
Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued	380	5,225	380	5,225
Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			68,860	5,750
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	3,000,000		3,000,000
Repurchase Agreements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	0	26,711		224,959

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Retirement Benefits [Abstract]
Defined Contribution Plan, Cost	$ (847)	$ (665)	$ (2,326)	$ (1,747)
Liability, Defined Benefit Plan	$ 585		$ 585		$ 719

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 945	$ 766
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(814)	(644)
Business Combination, Contingent Consideration, Liability, Noncurrent	(4,147)
Fair Value, Net Asset (Liability)	4,016	(122)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(73)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	(4,074)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	945	766
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(814)	(644)
Fair Value, Net Asset (Liability)	(131)	(122)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Noncurrent	(4,147)
Fair Value, Net Asset (Liability)	$ (4,147)	$ 0

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	$ 5,264	$ 3,232
Inventory, Work in Process, Gross	5,928	4,894
Inventory, Finished Goods, Gross	1,537	1,186
Other Inventory, Gross	58,833	15,577
Inventory, Net	$ 71,562	$ 24,889

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets Goodwill (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2021USD ($)
Goodwill [Line Items]
Goodwill	$ 53,763
Goodwill, Acquired During Period	38,264
Goodwill	92,027
Residential [Member]
Goodwill [Line Items]
Goodwill	16,219
Goodwill, Acquired During Period	34,902
Goodwill	51,121
Infrastructure Solutions [Member]
Goodwill [Line Items]
Goodwill	34,728
Goodwill, Acquired During Period	3,362
Goodwill	38,090
Communications [Member]
Goodwill [Line Items]
Goodwill	2,816
Goodwill	$ 2,816

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Jun. 30, 2021	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		$ 117,670	$ 58,026
Finite-Lived Intangible Assets, Accumulated Amortization		(28,369)	(18,669)
Intangible Assets, Net (Excluding Goodwill)		89,301	39,357
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		15,394	7,754
Finite-Lived Intangible Assets, Accumulated Amortization		(2,591)	(1,741)
Intangible Assets, Net (Excluding Goodwill)		$ 12,803	6,013
Trademarks and Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Trademarks and Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Technical Library
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Finite-Lived Intangible Assets, Gross		$ 400	400
Finite-Lived Intangible Assets, Accumulated Amortization		(156)	(141)
Intangible Assets, Net (Excluding Goodwill)		244	259
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		96,879	46,449
Finite-Lived Intangible Assets, Accumulated Amortization		(21,057)	(14,900)
Intangible Assets, Net (Excluding Goodwill)		$ 75,822	31,549
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years	6 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Finite-Lived Intangible Assets, Gross		$ 40	40
Finite-Lived Intangible Assets, Accumulated Amortization		(23)	(17)
Intangible Assets, Net (Excluding Goodwill)		$ 17	23
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Finite-Lived Intangible Assets, Gross		$ 4,957	3,383
Finite-Lived Intangible Assets, Accumulated Amortization		(4,542)	(1,870)
Intangible Assets, Net (Excluding Goodwill)		$ 415	$ 1,513

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Accrued Insurance, Current	$ 5,642	$ 6,254
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	4,527
Estimated cost of completion of bonded projects	98,342
Purchase Commitment, Remaining Minimum Amount Committed	13,771
Insurance Related [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	4,327	5,464
Vendor Related [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	$ 200	$ 200

Leases (Details)

Leases (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Leases [Abstract]
Operating Lease, Liability, Current	$ 13,668,000		$ 13,668,000		$ 11,056,000
Finance Lease, Liability, Current	832,000		832,000		$ 418,000
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	7,263,000		7,263,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	12,462,000		12,462,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,534,000		8,534,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	5,678,000		5,678,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	4,152,000		4,152,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five	9,245,000		9,245,000
Lessee, Operating Lease, Liability, Payments, Due	47,334,000		47,334,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	4,835,000		4,835,000
Operating Lease, Liability	42,499,000		42,499,000
Finance Lease, Liability, Payments, Due Next Twelve Months	431,000		431,000
Finance Lease, Liability, Payments, Due Year Two	843,000		843,000
Finance Lease, Liability, Payments, Due Year Three	831,000		831,000
Finance Lease, Liability, Payments, Due Year Four	787,000		787,000
Finance Lease, Liability, Payments, Due Year Five	503,000		503,000
Finance Lease, Liability, Payments, Due after Year Five	63,000		63,000
Finance Lease, Liability, Payment, Due	3,458,000		3,458,000
Finance Lease, Liability, Undiscounted Excess Amount	303,000		303,000
Finance Lease, Liability	3,155,000		3,155,000
Lessee, Total Lease, Liability, Payments, Remainder of Fiscal Year [Line Items]	7,694,000		7,694,000
Total Lease, Liability, Payments, Year Two	13,305,000		13,305,000
Total Lease, Liability, Payments, Year Three	9,365,000		9,365,000
Total Lease, Liability, Payments, Year Four	6,465,000		6,465,000
Total Lease, Liability, Payments, Year Five	4,655,000		4,655,000
Total Lease, Liability, Payments, Due After Year Five	9,308,000		9,308,000
Total Lease, Liability, Payments Due	50,792,000		50,792,000
Total Lease, Liability, Undiscounted Excess Amount	5,138,000		5,138,000
Total Lease, Liability	45,654,000		45,654,000
Lessee, Operating Lease, Lease Not yet Commenced, Description	5,979,000		5,979,000
Operating Lease, Cost	3,287,000	$ 2,967,000	10,337,000	$ 8,907,000
Finance Lease, Right-of-Use Asset, Amortization	176,000	64,000	418,000	124,000
Finance Lease, Interest Expense	33,000	15,000	81,000	30,000
Finance Lease, Cost	209,000	79,000	499,000	154,000
Short-term Lease, Cost	330,000	327,000	880,000	802,000
Variable Lease, Cost	321,000	190,000	954,000	618,000
Lease, Cost	4,147,000	3,563,000	12,670,000	10,481,000
Operating Lease, Payments	3,401,000	3,202,000	11,051,000	9,500,000
Finance Lease, Interest Payment on Liability	33,000	15,000	81,000	30,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	5,834,000	577,000	20,799,000	8,750,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 1,032,000	$ 270,000	$ 1,992,000	$ 1,198,000
Operating Lease, Weighted Average Remaining Lease Term	5 years 1 month 6 days		5 years 1 month 6 days		4 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days		4 years 3 months 18 days		4 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.80%		3.80%		3.90%
Finance Lease, Weighted Average Discount Rate, Percent	4.50%		4.50%		5.10%

Business Combinations and Div_3

Business Combinations and Divestitures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Combinations [Abstract]
Business Combination, Consideration Transferred			$ 92,694	$ 28,952
Escrow Deposit	$ 10,916		10,916
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			4,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	36,256		36,256
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	11,965		11,965
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	59,695		59,695
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	38,264		38,264
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	802		802
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(29,212)		(29,212)
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation	(342)		(342)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	(3,168)		(3,168)
Noncontrolling Interest, Increase from Business Combination			(21,566)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	92,694		92,694
Business Acquisition, Goodwill, Expected Tax Deductible Amount	24,611		$ 24,611
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			6 years 4 months 24 days
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	53,881		$ 98,420
Business Acquisition, Pro Forma Revenue	419,553	$ 347,179	1,147,234	1,051,916
Business Acquisition, Pro Forma Net Income (Loss)	19,709	$ 14,751	47,288	$ 31,370
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	665		3,101
Redeemable Noncontrolling Interest, Equity, Redemption Value	$ 17,355		$ 17,355