Overview and Summary of Significant Accounting Policies	9 Months Ended
Jun. 30, 2012
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. 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 condensed 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, 2011, which was filed with the SEC on December 12, 2011. 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 January 2010, the Financial Accounting Standards Board (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 became effective for us with the interim and annual reporting period beginning after December 15, 2010, our fiscal year 2012. We are not required to provide the amended disclosures for any previous periods presented for comparative purposes. Other than requiring additional disclosures, adoption of this update did not have a material impact on our consolidated financial statements. 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. This new guidance will be effective for us beginning October 1, 2012, and will have financial presentation changes only. In September 2011, the FASB issued new accounting guidance which simplifies how an entity is required to test goodwill for impairment. Under this guidance, an entity would be allowed to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity would not be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amounts. This new guidance includes a number of factors to consider in conducting the qualitative assessment. This guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, our fiscal year 2013. Early adoption is permitted; however, we will not adopt this guidance until October 1, 2012. This guidance is not expected to have a material impact on our reported results of operations or financial position. In July 2012, the FASB issued an accounting standards update regarding the testing of indefinite-lived intangible assets for impairment. Under this update, an entity has the option to first assess qualitative factors to determine whether the existence of events and circumstances indicate that it is more likely than not that the indefinite-lived intangible asset is impaired. If, after assessing the events and circumstances, an entity concludes that it is more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment testing by comparing the fair value with the carrying amount. An entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative test. An entity will be able to resume performing the qualitative assessment in any subsequent period. This update is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012, our fiscal year 2013. Early adoption is permitted; however, we will not adopt this guidance until October 1, 2012. This guidance is not expected to have a material impact on our reported results of operations or financial position. Subsequent Events We evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q. 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, 2012

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.

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 condensed 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, 2011, which was filed with the SEC on December 12, 2011.

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 January 2010, the Financial Accounting Standards Board (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 became effective for us with the interim and annual reporting period beginning after December 15, 2010, our fiscal year 2012. We are not required to provide the amended disclosures for any previous periods presented for comparative purposes. Other than requiring additional disclosures, adoption of this update did not have a material impact on our consolidated financial statements.

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. This new guidance will be effective for us beginning October 1, 2012, and will have financial presentation changes only.

In September 2011, the FASB issued new accounting guidance which simplifies how an entity is required to test goodwill for impairment. Under this guidance, an entity would be allowed to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity would not be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amounts. This new guidance includes a number of factors to consider in conducting the qualitative assessment. This guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, our fiscal year 2013. Early adoption is permitted; however, we will not adopt this guidance until October 1, 2012. This guidance is not expected to have a material impact on our reported results of operations or financial position.

In July 2012, the FASB issued an accounting standards update regarding the testing of indefinite-lived intangible assets for impairment. Under this update, an entity has the option to first assess qualitative factors to determine whether the existence of events and circumstances indicate that it is more likely than not that the indefinite-lived intangible asset is impaired. If, after assessing the events and circumstances, an entity concludes that it is more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment testing by comparing the fair value with the carrying amount. An entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative test. An entity will be able to resume performing the qualitative assessment in any subsequent period. This update is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012, our fiscal year 2013. Early adoption is permitted; however, we will not adopt this guidance until October 1, 2012. This guidance is not expected to have a material impact on our reported results of operations or financial position.

Subsequent Events

We evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q. 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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