Interim Statement Presentation (Policies)	6 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Use of Estimates	Basis of Presentation and Use of Estimates The accompanying unaudited condensed consolidated financial information should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Annual Report on Form 10-K for the year ended September 30, 2018 (“2018 Annual Report”) of Cemtrex Inc. (“Cemtrex” or the “Company”). A summary of the Company’s significant accounting policies is identified in Note 2 of the notes to the consolidated financial statements included in the Company’s 2018 Annual Report. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the Unites States (“US GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X pursuant to the requirements of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for the interim periods are not necessarily indicative of the results of operations for the entire year. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the condensed consolidated financial statements, the disclosure of contingent assets and liabilities in the condensed consolidated financial statements and the accompanying notes, and the reported amounts of revenues, expenses and cash flows during the periods presented. Actual amounts and results could differ from those estimates. The estimates and assumptions the Company makes are based on historical factors, current circumstances and the experience and judgment of the Company’s management. The Company evaluates its estimates and assumptions on an ongoing basis. The condensed consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries (Griffin Filters LLC, MIP Cemtrex Inc., Cemtrex Advanced Technologies Inc., Cemtrex Ltd., Cemtrex Technologies Pvt. Ltd., ROB Cemtrex GmbH, ROB Systems Srl, ROB Cemtrex Assets UG, ROB Cemtrex Logistics GmbH, and Advanced Industrial Services, Inc. and the variable interest entity Vicon Industries, Inc. All inter-company balances and transactions have been eliminated in consolidation.
Significant Accounting Policies and Recent Accounting Pronouncements	Significant Accounting Policies and Recent Accounting Pronouncements Significant Accounting Policies Note 2 of the Notes to Consolidated Financial Statements, included in the annual report on Form 10-K for the year ended September 30, 2018, includes a summary of the significant accounting policies used in the preparation of the consolidated financial statements. Recently Adopted Accounting Pronouncements Adoption of ASC 606 Effective October 1, 2018, the Company adopted ASC 606 using the modified retrospective approach for all of its contracts. Following the adoption of ASC 606, the Company continues to recognize revenue at a point-in-time when control of goods transfers to the customer. This is consistent with the Company’s previous revenue recognition accounting policy under which the Company recognized revenue when title and risk of loss pass to the customer and collectability was reasonably assured. ASC 606 did not impact the Company’s presentation of revenue on a gross or net basis. The Company recognizes contract revenue from the sales of services for rigging, millwrighting, in plant maintenance, equipment erection, relocation, and disassembly. In addition, there was no impact of adoption on the statement of operations or balance sheet as of March 31, 2019 or for the three and six months then ended. The Company expects the impact of adopting the new revenue standard to be immaterial to net income on an ongoing basis. Revenue Recognition The Company recognizes revenue from sales of services for rigging, millwrighting, in plant maintenance, equipment erection, relocation, and disassembly at the point in time when the performance obligations in the contract are met, which is when the customer obtains control of such products and typically occurs upon delivery depending on the terms of the underlying contracts. Revenue is measured as the amount of consideration expected to be received in exchange for transferring goods or providing services. In some instances, the Company enters into contracts with customers that contain multiple performance obligations to deliver volumes of co-products over a contractual period of less than 12 months. The Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices and recognizes the related revenue as control of each individual product is transferred to the customer in satisfaction of the corresponding performance obligation. Recently Issued Accounting Standards In February 2016, The FASB issued ASU 2016-02 (Topic 842), “Leases”. ASU 2016-02 requires that a lessee recognize the assets and liabilities that arise from operating leases. A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company will adopt this standard starting October 1, 2019. The Company does not believe adoption will have a material effect on its financial position. Reclassifications Certain reclassifications have been made to prior period amounts to conform to the current period presentation.

Interim Statement Presentation (Policies)

6 Months Ended

Mar. 31, 2019

Basis of Presentation and Use of Estimates

Basis of Presentation and Use of Estimates

The accompanying unaudited condensed consolidated financial information should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Annual Report on Form 10-K for the year ended September 30, 2018 (“2018 Annual Report”) of Cemtrex Inc. (“Cemtrex” or the “Company”). A summary of the Company’s significant accounting policies is identified in Note 2 of the notes to the consolidated financial statements included in the Company’s 2018 Annual Report.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the Unites States (“US GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X pursuant to the requirements of the U.S. Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for the interim periods are not necessarily indicative of the results of operations for the entire year.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the condensed consolidated financial statements, the disclosure of contingent assets and liabilities in the condensed consolidated financial statements and the accompanying notes, and the reported amounts of revenues, expenses and cash flows during the periods presented. Actual amounts and results could differ from those estimates. The estimates and assumptions the Company makes are based on historical factors, current circumstances and the experience and judgment of the Company’s management. The Company evaluates its estimates and assumptions on an ongoing basis.

The condensed consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries (Griffin Filters LLC, MIP Cemtrex Inc., Cemtrex Advanced Technologies Inc., Cemtrex Ltd., Cemtrex Technologies Pvt. Ltd., ROB Cemtrex GmbH, ROB Systems Srl, ROB Cemtrex Assets UG, ROB Cemtrex Logistics GmbH, and Advanced Industrial Services, Inc. and the variable interest entity Vicon Industries, Inc. All inter-company balances and transactions have been eliminated in consolidation.

Significant Accounting Policies and Recent Accounting Pronouncements

Significant Accounting Policies and Recent Accounting Pronouncements

Significant Accounting Policies

Note 2 of the Notes to Consolidated Financial Statements, included in the annual report on Form 10-K for the year ended September 30, 2018, includes a summary of the significant accounting policies used in the preparation of the consolidated financial statements.

Recently Adopted Accounting Pronouncements

Adoption of ASC 606

Effective October 1, 2018, the Company adopted ASC 606 using the modified retrospective approach for all of its contracts. Following the adoption of ASC 606, the Company continues to recognize revenue at a point-in-time when control of goods transfers to the customer. This is consistent with the Company’s previous revenue recognition accounting policy under which the Company recognized revenue when title and risk of loss pass to the customer and collectability was reasonably assured. ASC 606 did not impact the Company’s presentation of revenue on a gross or net basis. The Company recognizes contract revenue from the sales of services for rigging, millwrighting, in plant maintenance, equipment erection, relocation, and disassembly. In addition, there was no impact of adoption on the statement of operations or balance sheet as of March 31, 2019 or for the three and six months then ended. The Company expects the impact of adopting the new revenue standard to be immaterial to net income on an ongoing basis.

Revenue Recognition

The Company recognizes revenue from sales of services for rigging, millwrighting, in plant maintenance, equipment erection, relocation, and disassembly at the point in time when the performance obligations in the contract are met, which is when the customer obtains control of such products and typically occurs upon delivery depending on the terms of the underlying contracts. Revenue is measured as the amount of consideration expected to be received in exchange for transferring goods or providing services. In some instances, the Company enters into contracts with customers that contain multiple performance obligations to deliver volumes of co-products over a contractual period of less than 12 months. The Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices and recognizes the related revenue as control of each individual product is transferred to the customer in satisfaction of the corresponding performance obligation.

Recently Issued Accounting Standards

In February 2016, The FASB issued ASU 2016-02 (Topic 842), “Leases”. ASU 2016-02 requires that a lessee recognize the assets and liabilities that arise from operating leases. A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company will adopt this standard starting October 1, 2019. The Company does not believe adoption will have a material effect on its financial position.

Reclassifications

Certain reclassifications have been made to prior period amounts to conform to the current period presentation.