Business	12 Months Ended
Sep. 30, 2018
Business [Abstract]
Description of the Business	1. BUSINESS Description of the Business IES Holdings, Inc. is a holding company that owns and manages operating subsidiaries in business activities across a variety of end-markets. Our operations are currently organized into four principal business segments, based upon the nature of our current services: 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. Communications – Nationwide provider of technology infrastructure products and services to large corporations and independent businesses. Infrastructure Solutions – Provider of electro-mechanical solutions for industrial operations, including apparatus repair and custom-engineered products. Residential – Regional provider of electrical installation services for single-family housing and multi-family apartment complexes. The words “IES”, the “Company”, “we”, “our”, and “us” refer to IES Holdings, Inc. and, except as otherwise specified herein, to our consolidated subsidiaries. Controlling Shareholder At September 30, 2018, Tontine Associates, L.L.C. and its affiliates (collectively, “Tontine”), was the controlling shareholder of the Company’s common stock. Accordingly, Tontine has the ability to exercise significant control over our affairs, including the election of directors and most actions requiring the approval of shareholders, including the approval of any potential merger or sale of all or substantially all assets or segments of the Company, or the Company itself. For a more complete discussion on our relationship with Tontine, please refer to Note 3, “Controlling Shareholder” in the notes to our Consolidated Financial Statements.

1. BUSINESS

Description of the Business

IES Holdings, Inc. is a holding company that owns and manages operating subsidiaries in business activities across a variety of end-markets. Our operations are currently organized into four principal business segments, based upon the nature of our current services:

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.
Communications – Nationwide provider of technology infrastructure products and services to large corporations and independent businesses.
Infrastructure Solutions – Provider of electro-mechanical solutions for industrial operations, including apparatus repair and custom-engineered products.
Residential – Regional provider of electrical installation services for single-family housing and multi-family apartment complexes.

The words “IES”, the “Company”, “we”, “our”, and “us” refer to IES Holdings, Inc. and, except as otherwise specified herein, to our consolidated subsidiaries.

Controlling Shareholder

At September 30, 2018, Tontine Associates, L.L.C. and its affiliates (collectively, “Tontine”), was the controlling shareholder of the Company’s common stock. Accordingly, Tontine has the ability to exercise significant control over our affairs, including the election of directors and most actions requiring the approval of shareholders, including the approval of any potential merger or sale of all or substantially all assets or segments of the Company, or the Company itself. For a more complete discussion on our relationship with Tontine, please refer to Note 3, “Controlling Shareholder” in the notes to our Consolidated Financial Statements.