Overview and Summary of Significant Accounting Policies	9 Months Ended
Jun. 30, 2011
Overview and Summary of Significant Accounting Policies [Abstract]
OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	A. 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 corporation 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.; Transdyn, Inc.; Powell Industries International, Inc.; Switchgear & Instrumentation Limited (S&I) and Powell Canada Inc. We develop, design, manufacture and service custom engineered-to-order equipment and systems for the management and control of electrical energy and other critical processes. Headquartered in Houston, Texas, we serve the transportation, environmental, energy, industrial and utility industries. In December 2009, we acquired the business and certain assets of PowerComm Inc. and its subsidiaries (referred to herein as Powell Canada) for $23.4 million, not including acquisition-related expenses. Powell Canada is headquartered in Edmonton, Alberta, Canada, and provides electrical and maintenance services. Powell Canada is also a manufacturer of switchgear and related products, primarily serving the oil and gas industry in western Canada. The operating results of Powell Canada are included in our Electrical Power Products business segment from the acquisition date. For further information on the Powell Canada acquisition, see Note C. 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 pursuant to the rules of the Securities and Exchange Commission (SEC). 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. We believe that the disclosures made are adequate to make the information presented not misleading. 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 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. The year-end balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. 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, 2010, which was filed with the SEC on December 8, 2010. Reclassifications Certain reclassifications have been made in prior year’s financial statements to conform to the presentation used in the current year. These reclassifications have not resulted in any changes to previously reported net income for any periods. Use of Estimates The preparation of financial statements in conformity with 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 financial statements affect revenue and cost recognition for construction contracts, the allowance for doubtful accounts, provision for excess and obsolete inventory, goodwill and other intangible assets, self-insurance, warranty accruals, income taxes and estimates related to acquisition valuations. The amounts recorded for insurance claims, warranties, legal, income taxes 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. Estimates may change as new events occur, additional information becomes available or operating environments change. Actual results may differ from our estimates. New Accounting Standards In April 2009, the Financial Accounting Standards Board (FASB) issued accounting guidance regarding the accounting for assets acquired and liabilities assumed in a business combination arising from contingencies. This guidance clarifies the initial and subsequent recognition, subsequent accounting and disclosure of assets and liabilities arising from such contingencies in a business combination. This guidance requires that assets acquired and liabilities assumed in a business combination that arise from contingencies be recognized at fair value, if the acquisition-date fair value can be reasonably estimated. If the acquisition-date fair value of an asset or liability cannot be reasonably estimated, the asset or liability would be measured at the amount that would be recognized using the accounting guidance related to accounting for contingencies or the guidance for reasonably estimating losses. This accounting guidance became effective for us on October 1, 2010. The adoption of this guidance did not have an impact on our consolidated financial statements. In January 2010, the FASB issued updated guidance to amend the disclosure requirements related to recurring and nonrecurring fair value measurements. This update requires new disclosures about significant transfers of assets and liabilities between Level 1 and Level 2 of the fair value hierarchy (including the reasons for these transfers) and the reasons for any transfers in or out of Level 3. This update also requires a reconciliation of recurring Level 3 measurements about purchases, sales, issuances and settlements on a gross basis. In addition to these new disclosure requirements, this update clarifies certain existing disclosure requirements. For example, this update clarifies that reporting entities are required to provide fair value measurement disclosures for each class of assets and liabilities, rather than each major category of assets or liabilities. This update also clarifies the requirement for entities to disclose information about both the valuation techniques and inputs used in estimating Level 2 and Level 3 fair value measurements. This update became effective for us with the interim and annual reporting period beginning after December 15, 2009, our fiscal year 2011, except for the requirement to provide the Level 3 activity of purchases, sales, issuances and settlements on a gross basis, which will become effective for us with the interim and annual reporting period beginning after December 15, 2010, our fiscal year 2012. We will not be required to provide the amended disclosures for any previous periods presented for comparative purposes. Other than requiring additional disclosures, adoption of this update for the provisions currently in effect for us did not have a material impact on our consolidated financial statements. In April 2010, the FASB issued accounting guidance for the milestone method of revenue recognition. This guidance allows entities to make a policy election to use the milestone method of revenue recognition and provides guidance on defining a milestone and the criteria that should be met for applying the milestone method. The scope of this guidance is limited to transactions involving milestones relating to research and development. The guidance includes enhanced disclosure requirements about each arrangement, individual milestones and related contingent consideration, information about substantive milestones and factors considered in the determination. This guidance is effective prospectively to milestones achieved in fiscal years, and interim periods within those years, beginning after June 15, 2010. Early application and retrospective application are permitted. We have evaluated this new guidance and have determined that it will not currently have a significant impact on the determination or reporting of our financial results. In May 2011, the FASB issued accounting guidance related to fair value measurement, which amends current guidance to achieve common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards. This guidance generally represents clarification of fair value measurement standards, but also includes instances where a particular principle or requirement for measuring fair value or disclosing information about fair value measurements has changed. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. We will adopt this guidance for our fiscal year beginning October 1, 2012. We do not expect this pronouncement to have a material effect on our consolidated financial statements. In June 2011, the FASB issued new accounting guidance on the presentation of comprehensive income in financial statements. Entities are required to present total comprehensive income either in a single, continuous statement of comprehensive income or in two separate, but consecutive, statements. Under the single-statement approach, entities must include the components of net income, a total for net income, the components of other comprehensive income and a total for comprehensive income. Under the two-statement approach, entities must report an income statement and, immediately following, a statement of other comprehensive income. Under either method, entities must display adjustments for items reclassified from other comprehensive income to net income in both net income and other comprehensive income. The provisions for this guidance are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, with early adoption permitted. We will adopt this guidance for our fiscal year beginning October 1, 2012. Subsequent Events We evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q/A. No significant events occurred subsequent to the balance sheet or prior to the filing of this report that would have a material impact on our consolidated financial statements or results of operations taken as a whole.

Overview and Summary of Significant Accounting Policies

9 Months Ended

Jun. 30, 2011

Overview and Summary of Significant Accounting Policies [Abstract]

OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A. 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 corporation 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.; Transdyn, Inc.; Powell Industries International, Inc.; Switchgear & Instrumentation Limited (S&I) and Powell Canada Inc.

We develop, design, manufacture and service custom engineered-to-order equipment and systems for the management and control of electrical energy and other critical processes. Headquartered in Houston, Texas, we serve the transportation, environmental, energy, industrial and utility industries.

In December 2009, we acquired the business and certain assets of PowerComm Inc. and its subsidiaries (referred to herein as Powell Canada) for $23.4 million, not including acquisition-related expenses. Powell Canada is headquartered in Edmonton, Alberta, Canada, and provides electrical and maintenance services. Powell Canada is also a manufacturer of switchgear and related products, primarily serving the oil and gas industry in western Canada. The operating results of Powell Canada are included in our Electrical Power Products business segment from the acquisition date. For further information on the Powell Canada acquisition, see Note C.

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 pursuant to the rules of the Securities and Exchange Commission (SEC). 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. We believe that the disclosures made are adequate to make the information presented not misleading. 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 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. The year-end balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP.

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, 2010, which was filed with the SEC on December 8, 2010.

Reclassifications

Certain reclassifications have been made in prior year’s financial statements to conform to the presentation used in the current year. These reclassifications have not resulted in any changes to previously reported net income for any periods.

Use of Estimates

The preparation of financial statements in conformity with 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 financial statements affect revenue and cost recognition for construction contracts, the allowance for doubtful accounts, provision for excess and obsolete inventory, goodwill and other intangible assets, self-insurance, warranty accruals, income taxes and estimates related to acquisition valuations. The amounts recorded for insurance claims, warranties, legal, income taxes 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. Estimates may change as new events occur, additional information becomes available or operating environments change. Actual results may differ from our estimates.

New Accounting Standards

In April 2009, the Financial Accounting Standards Board (FASB) issued accounting guidance regarding the accounting for assets acquired and liabilities assumed in a business combination arising from contingencies. This guidance clarifies the initial and subsequent recognition, subsequent accounting and disclosure of assets and liabilities arising from such contingencies in a business combination. This guidance requires that assets acquired and liabilities assumed in a business combination that arise from contingencies be recognized at fair value, if the acquisition-date fair value can be reasonably estimated. If the acquisition-date fair value of an asset or liability cannot be reasonably estimated, the asset or liability would be measured at the amount that would be recognized using the accounting guidance related to accounting for contingencies or the guidance for reasonably estimating losses. This accounting guidance became effective for us on October 1, 2010. The adoption of this guidance did not have an impact on our consolidated financial statements.

In January 2010, the FASB issued updated guidance to amend the disclosure requirements related to recurring and nonrecurring fair value measurements. This update requires new disclosures about significant transfers of assets and liabilities between Level 1 and Level 2 of the fair value hierarchy (including the reasons for these transfers) and the reasons for any transfers in or out of Level 3. This update also requires a reconciliation of recurring Level 3 measurements about purchases, sales, issuances and settlements on a gross basis. In addition to these new disclosure requirements, this update clarifies certain existing disclosure requirements. For example, this update clarifies that reporting entities are required to provide fair value measurement disclosures for each class of assets and liabilities, rather than each major category of assets or liabilities. This update also clarifies the requirement for entities to disclose information about both the valuation techniques and inputs used in estimating Level 2 and Level 3 fair value measurements. This update became effective for us with the interim and annual reporting period beginning after December 15, 2009, our fiscal year 2011, except for the requirement to provide the Level 3 activity of purchases, sales, issuances and settlements on a gross basis, which will become effective for us with the interim and annual reporting period beginning after December 15, 2010, our fiscal year 2012. We will not be required to provide the amended disclosures for any previous periods presented for comparative purposes. Other than requiring additional disclosures, adoption of this update for the provisions currently in effect for us did not have a material impact on our consolidated financial statements.

In April 2010, the FASB issued accounting guidance for the milestone method of revenue recognition. This guidance allows entities to make a policy election to use the milestone method of revenue recognition and provides guidance on defining a milestone and the criteria that should be met for applying the milestone method. The scope of this guidance is limited to transactions involving milestones relating to research and development. The guidance includes enhanced disclosure requirements about each arrangement, individual milestones and related contingent consideration, information about substantive milestones and factors considered in the determination. This guidance is effective prospectively to milestones achieved in fiscal years, and interim periods within those years, beginning after June 15, 2010. Early application and retrospective application are permitted. We have evaluated this new guidance and have determined that it will not currently have a significant impact on the determination or reporting of our financial results.

In May 2011, the FASB issued accounting guidance related to fair value measurement, which amends current guidance to achieve common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards. This guidance generally represents clarification of fair value measurement standards, but also includes instances where a particular principle or requirement for measuring fair value or disclosing information about fair value measurements has changed. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. We will adopt this guidance for our fiscal year beginning October 1, 2012. We do not expect this pronouncement to have a material effect on our consolidated financial statements.

In June 2011, the FASB issued new accounting guidance on the presentation of comprehensive income in financial statements. Entities are required to present total comprehensive income either in a single, continuous statement of comprehensive income or in two separate, but consecutive, statements. Under the single-statement approach, entities must include the components of net income, a total for net income, the components of other comprehensive income and a total for comprehensive income. Under the two-statement approach, entities must report an income statement and, immediately following, a statement of other comprehensive income. Under either method, entities must display adjustments for items reclassified from other comprehensive income to net income in both net income and other comprehensive income. The provisions for this guidance are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, with early adoption permitted. We will adopt this guidance for our fiscal year beginning October 1, 2012.

Subsequent Events

We evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q/A. No significant events occurred subsequent to the balance sheet or prior to the filing of this report that would have a material impact on our consolidated financial statements or results of operations taken as a whole.

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

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