Overview and Summary of Significant Accounting Policies	6 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Overview and Summary of Significant Accounting Policies	Overview and Summary of Significant Accounting Policies Overview Powell Industries, Inc. (we, us, our, Powell or the Company) was incorporated in the state of Delaware in 2004 as a successor to a Nevada company incorporated in 1968. The Nevada company was the successor to a company founded by William E. Powell in 1947, which merged into the Company in 1977. Our major subsidiaries, all of which are wholly owned, include: Powell Electrical Systems, Inc.; Powell (UK) Limited; Powell Canada Inc. and Powell Industries International, B.V. We develop, design, manufacture and service custom-engineered equipment and systems for the distribution, control and monitoring of electrical energy. Headquartered in Houston, Texas, we serve the oil and gas markets, including onshore and offshore oil and gas production, pipeline, refining and liquid natural gas terminals, as well as petrochemical, electric utility, light rail traction power and other heavy industrial markets. Basis of Presentation These unaudited condensed consolidated financial statements include the accounts of Powell and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X for interim financial information. Certain information and footnote disclosures, normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP), have been condensed or omitted pursuant to those rules and regulations. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the financial position, results of operations and cash flows with respect to the interim condensed consolidated financial statements have been included. The results of operations for the interim periods are not necessarily indicative of the results for the entire fiscal year. We believe that these financial statements contain all adjustments necessary so that they are not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto of Powell and its subsidiaries included in Powell’s Annual Report on Form 10-K for the year ended September 30, 2019, which was filed with the Securities and Exchange Commission (SEC) on December 5, 2019. References to Fiscal 2020 and Fiscal 2019 used throughout this report shall mean our fiscal years ended September 30, 2020 and 2019, respectively. Use of Estimates The preparation of condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States (U.S. GAAP) requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying footnotes. The most significant estimates used in our condensed consolidated financial statements affect revenue recognition and estimated cost recognition on our customer contracts, the allowance for doubtful accounts, provision for excess and obsolete inventory, warranty accruals and income taxes. The amounts recorded for warranties, legal, income taxes, impairment of long-lived assets (when applicable) and other contingent liabilities require judgments regarding the amount of expenses that will ultimately be incurred. We base our estimates on historical experience and on various other assumptions, as well as the specific circumstances surrounding these contingent liabilities, in evaluating the amount of liability that should be recorded. Additionally, the recognition of deferred tax assets requires estimates related to future income and other assumptions regarding timing and future profitability because the ultimate realization of net deferred tax assets is dependent on the generation of future taxable income during the periods in which temporary differences become deductible. Estimates routinely change as new events occur, additional information becomes available or operating environments change. Actual results may differ from our prior estimates. New Accounting Standards Effective October 1, 2019, we adopted the new lease accounting standard and recorded operating lease assets and operating lease liabilities of approximately $7.0 million and determined that no adjustment to retained earnings was necessary. Financial results for reporting periods after October 1, 2019 are reported under the new standard; however financial results for prior periods were not adjusted and will continue to be presented in accordance with the previous standard. Upon adoption, we elected a package of practical expedients which, among other things, allowed for the historical classification of our existing leases to carryforward. Additionally, we elected to separate non-lease components for our real estate and IT infrastructure asset classes. All other asset classes account for both lease and non-lease components in the operating lease asset and operating lease liability calculations. See Note I for further discussion of leases.

Overview and Summary of Significant Accounting Policies

Overview

Powell Industries, Inc. (we, us, our, Powell or the Company) was incorporated in the state of Delaware in 2004 as a successor to a Nevada company incorporated in 1968. The Nevada company was the successor to a company founded by William E. Powell in 1947, which merged into the Company in 1977. Our major subsidiaries, all of which are wholly owned, include: Powell Electrical Systems, Inc.; Powell (UK) Limited; Powell Canada Inc. and Powell Industries International, B.V.

We develop, design, manufacture and service custom-engineered equipment and systems for the distribution, control and monitoring of electrical energy. Headquartered in Houston, Texas, we serve the oil and gas markets, including onshore and offshore oil and gas production, pipeline, refining and liquid natural gas terminals, as well as petrochemical, electric utility, light rail traction power and other heavy industrial markets.

Basis of Presentation

These unaudited condensed consolidated financial statements include the accounts of Powell and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X for interim financial information. Certain information and footnote disclosures, normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP), have been condensed or omitted pursuant to those rules and regulations. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the financial position, results of operations and cash flows with respect to the interim condensed consolidated financial statements have been included. The results of operations for the interim periods are not necessarily indicative of the results for the entire fiscal year. We believe that these financial statements contain all adjustments necessary so that they are not misleading.

These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto of Powell and its subsidiaries included in Powell’s Annual Report on Form 10-K for the year ended September 30, 2019, which was filed with the Securities and Exchange Commission (SEC) on December 5, 2019.

References to Fiscal 2020 and Fiscal 2019 used throughout this report shall mean our fiscal years ended September 30, 2020 and 2019, respectively.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States (U.S. GAAP) requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying footnotes. The most significant estimates used in our condensed consolidated financial statements affect revenue recognition and estimated cost recognition on our customer contracts, the allowance for doubtful accounts, provision for excess and obsolete inventory, warranty accruals and income taxes. The amounts recorded for warranties, legal, income taxes, impairment of long-lived assets (when applicable) and other contingent liabilities require judgments regarding the amount of expenses that will ultimately be incurred. We base our estimates on historical experience and on various other assumptions, as well as the specific circumstances surrounding these contingent liabilities, in evaluating the amount of liability that should be recorded. Additionally, the recognition of deferred tax assets requires estimates related to future income and other assumptions regarding timing and future profitability because the ultimate realization of net deferred tax assets is dependent on the generation of future taxable income during the periods in which temporary differences become deductible. Estimates routinely change as new events occur, additional information becomes available or operating environments change. Actual results may differ from our prior estimates.

New Accounting Standards

Effective October 1, 2019, we adopted the new lease accounting standard and recorded operating lease assets and operating lease liabilities of approximately $7.0 million and determined that no adjustment to retained earnings was necessary. Financial results for reporting periods after October 1, 2019 are reported under the new standard; however financial results for prior periods were not adjusted and will continue to be presented in accordance with the previous standard. Upon adoption, we elected a package of practical expedients which, among other things, allowed for the historical classification of our existing leases to carryforward. Additionally, we elected to separate non-lease components for our real estate and IT infrastructure asset classes. All other asset classes account for both lease and non-lease components in the operating lease asset and operating lease liability calculations. See Note I for further discussion of leases.