Basis of Presentation and Principles of Consolidation (Policies)	6 Months Ended
Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements of Manhattan Associates, Inc. and its subsidiaries (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information, with the instructions to Form 10-Q and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required for complete financial statements. In the opinion of management, these condensed consolidated financial statements contain all normal recurring adjustments considered necessary for a fair presentation of the Company’s financial position at June 30, 2017, the results of operations for the three and six months ended June 30, 2017 and 2016, and cash flows for the six months ended June 30, 2017 and 2016. The results for the three and six months ended June 30, 2017 are not necessarily indicative of the results to be expected for the full year. These statements should be read in conjunction with the Company’s audited consolidated financial statements and management’s discussion and analysis included in the Company’s annual report on Form 10-K for the year ended December 31, 2016.
Principles of Consolidation	Principles of Consolidation The accompanying condensed consolidated financial statements include the Company’s accounts and the accounts of its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
New Accounting Pronouncements Adopted in Fiscal Year 2017 and Not Yet Adopted	New Accounting Pronouncements Adopted in Fiscal Year 2017 Stock Compensation During the three months ended March 31, 2017, we adopted Accounting Standards Update (ASU) 2016-09, Compensation – Stock Compensation: Improvements to Employee Share-Based Payment Accounting, to improve the accounting for employee share-based payments. Under the new guidance, all excess tax benefits and certain tax deficiencies are recorded as income tax expense or benefit in the income statement rather than recorded in additional paid-in capital. The additional paid-in capital pools are eliminated. This new guidance must be applied on a prospective basis. As a result, the excess tax benefits of $1.9 million for the six months ended June 30, 2017 are recorded in our provision for income taxes rather than additional paid-in capital. As required by the ASU, excess tax benefits recognized on share-based compensation expense are classified as an operating activity on the statement of cash flows rather than as a financing activity, and we have applied this provision on a prospective basis. The ASU also allows the Company to repurchase more of an employee’s shares than it previously could for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. We have elected to account for forfeitures as they occur, rather than estimate expected forfeitures over the course of a vesting period. As a result, the net cumulative-effect of this election was recognized as a $1.8 million increase to additional paid-in capital, a $0.5 million increase to deferred tax assets and a $1.3 million decrease to retained earnings as of January 1, 2017. In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation: Scope of Modification Accounting to clarify when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Entities should apply the modification accounting guidance if the fair value, vesting conditions or classification of the award changes. The new guidance is effective for all entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 on a prospective basis to an award modified on or after the adoption date. Early adoption is permitted. We early adopted this guidance during the three months ended June 2017, and the adoption did not impact our financial statements. Goodwill Impairment In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350) that simplifies the test for goodwill impairment, which eliminates step two from the goodwill impairment test. Under the new guidance, an entity should recognize an impairment charge for the amount based on the excess of a reporting unit’s carrying amount over its fair value. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. For public companies, the guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019 on a prospective basis, and earlier adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We early adopted this guidance during the three months ended March 2017, and the adoption did not impact our financial statements. Classification of Certain Cash Receipts and Cash Payments on the Statement of Cash Flows In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments (Topic 230) that clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. Prior to the issuance, there were certain issues where diversity in practice in how certain cash receipts and cash payments were presented and classified in the statement of cash flows. This guidance addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. For public companies, the guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We early adopted this guidance during the three months ended June 30, 2017, and the adoption did not impact our financial statements. New Accounting Pronouncements Not Yet Adopted Revenue Recognition In May 2014, the FASB issued ASU 2014-09, Revenue Recognition – Revenue from Contracts with Customers (Topic 606), which will replace substantially all current revenue recognition guidance once it becomes effective. The new standard provides accounting guidance for all revenue arising from contracts with customers and affects all entities that enter into contracts to provide goods or services to their customers unless the contracts are in the scope of other standards. The new standard is less prescriptive and may require software entities to use more judgment and estimates in the revenue recognition process than are required under existing revenue guidance. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606) – Principal versus Agent Considerations, which clarifies the implementation guidance for principal versus agent considerations in ASU 2014-09. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606) – Identifying Performance Obligations and Licensing, which amends the guidance in ASU 2014-09 related to identifying performance obligations and accounting for licenses of intellectual property. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606) – Narrow-Scope Improvements and Practical Expedients, which clarifies the following aspects in ASU 2014-09: collectability, presentation of sales taxes and other similar taxes collected from customers, noncash considerations, contract modifications at transition, completed contracts at transition, and technical correction. In December 2016, the FASB issued ASU 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which provides thirteen technical corrections and improvements to the new revenue standard. We must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 with ASU 2014-09, which is effective for annual and interim periods beginning after December 15, 2017. The new revenue standard may be applied using either of the following transition methods: (1) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (2) a modified retrospective approach with the cumulative effect of initially adopting the standard recognized at the date of adoption (which includes additional footnote disclosures). We will adopt the standard in the first quarter of 2018 and expect to use the modified retrospective method. Currently, we are in the process of reviewing our historical contracts to quantify the impact that the adoption of the standard will have on specific performance obligations. We expect to recognize our hardware revenue net of related cost under the new standard which will reduce both hardware revenue and cost of sales as compared to our current accounting. We are also continuing to evaluate the impact of the standard on our recognition of costs related to obtaining customer contracts. Currently, sales commissions are expensed in sales and marketing expense when earned. We believe these commissions represent direct incremental costs of obtaining our contracts with customers. Under the standard, these costs must be expensed on a systematic basis that is consistent with the transfer of the related goods and services to the customer. Based on expected renewals of customer support and software enhancements and sales of optional implementation services, we believe a portion of our commissions expense should be deferred and amortized over time as the corresponding services are transferred to the customer under the new standard. Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP—which requires only capital leases to be recognized on the balance sheet—the new ASU will require both types of leases to be recognized on the balance sheet. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. For public companies, this guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods, but may be adopted earlier. We are currently evaluating the impact that the adoption of this standard will have on our Consolidated Financial Statements.

New Accounting Pronouncements Adopted in Fiscal Year 2017

Stock Compensation

During the three months ended March 31, 2017, we adopted Accounting Standards Update (ASU) 2016-09, Compensation – Stock Compensation: Improvements to Employee Share-Based Payment Accounting, to improve the accounting for employee share-based payments. Under the new guidance, all excess tax benefits and certain tax deficiencies are recorded as income tax expense or benefit in the income statement rather than recorded in additional paid-in capital. The additional paid-in capital pools are eliminated. This new guidance must be applied on a prospective basis. As a result, the excess tax benefits of $1.9 million for the six months ended June 30, 2017 are recorded in our provision for income taxes rather than additional paid-in capital. As required by the ASU, excess tax benefits recognized on share-based compensation expense are classified as an operating activity on the statement of cash flows rather than as a financing activity, and we have applied this provision on a prospective basis.

The ASU also allows the Company to repurchase more of an employee’s shares than it previously could for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. We have elected to account for forfeitures as they occur, rather than estimate expected forfeitures over the course of a vesting period. As a result, the net cumulative-effect of this election was recognized as a $1.8 million increase to additional paid-in capital, a $0.5 million increase to deferred tax assets and a $1.3 million decrease to retained earnings as of January 1, 2017.

In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation: Scope of Modification Accounting to clarify when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. Entities should apply the modification accounting guidance if the fair value, vesting conditions or classification of the award changes. The new guidance is effective for all entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 on a prospective basis to an award modified on or after the adoption date. Early adoption is permitted. We early adopted this guidance during the three months ended June 2017, and the adoption did not impact our financial statements.

Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350) that simplifies the test for goodwill impairment, which eliminates step two from the goodwill impairment test. Under the new guidance, an entity should recognize an impairment charge for the amount based on the excess of a reporting unit’s carrying amount over its fair value. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. For public companies, the guidance is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019 on a prospective basis, and earlier adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We early adopted this guidance during the three months ended March 2017, and the adoption did not impact our financial statements.

Classification of Certain Cash Receipts and Cash Payments on the Statement of Cash Flows

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments (Topic 230) that clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. Prior to the issuance, there were certain issues where diversity in practice in how certain cash receipts and cash payments were presented and classified in the statement of cash flows. This guidance addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. For public companies, the guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We early adopted this guidance during the three months ended June 30, 2017, and the adoption did not impact our financial statements.

New Accounting Pronouncements Not Yet Adopted

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, Revenue Recognition – Revenue from Contracts with Customers (Topic 606), which will replace substantially all current revenue recognition guidance once it becomes effective. The new standard provides accounting guidance for all revenue arising from contracts with customers and affects all entities that enter into contracts to provide goods or services to their customers unless the contracts are in the scope of other standards. The new standard is less prescriptive and may require software entities to use more judgment and estimates in the revenue recognition process than are required under existing revenue guidance.

In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606) – Principal versus Agent Considerations, which clarifies the implementation guidance for principal versus agent considerations in ASU 2014-09. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606) – Identifying Performance Obligations and Licensing, which amends the guidance in ASU 2014-09 related to identifying performance obligations and accounting for licenses of intellectual property. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606) – Narrow-Scope Improvements and Practical Expedients, which clarifies the following aspects in ASU 2014-09: collectability, presentation of sales taxes and other similar taxes collected from customers, noncash considerations, contract modifications at transition, completed contracts at transition, and technical correction. In December 2016, the FASB issued ASU 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which provides thirteen technical corrections and improvements to the new revenue standard. We must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 with ASU 2014-09, which is effective for annual and interim periods beginning after December 15, 2017.

The new revenue standard may be applied using either of the following transition methods: (1) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (2) a modified retrospective approach with the cumulative effect of initially adopting the standard recognized at the date of adoption (which includes additional footnote disclosures).

We will adopt the standard in the first quarter of 2018 and expect to use the modified retrospective method. Currently, we are in the process of reviewing our historical contracts to quantify the impact that the adoption of the standard will have on specific performance obligations. We expect to recognize our hardware revenue net of related cost under the new standard which will reduce both hardware revenue and cost of sales as compared to our current accounting. We are also continuing to evaluate the impact of the standard on our recognition of costs related to obtaining customer contracts. Currently, sales commissions are expensed in sales and marketing expense when earned. We believe these commissions represent direct incremental costs of obtaining our contracts with customers. Under the standard, these costs must be expensed on a systematic basis that is consistent with the transfer of the related goods and services to the customer. Based on expected renewals of customer support and software enhancements and sales of optional implementation services, we believe a portion of our commissions expense should be deferred and amortized over time as the corresponding services are transferred to the customer under the new standard.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP—which requires only capital leases to be recognized on the balance sheet—the new ASU will require both types of leases to be recognized on the balance sheet. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. For public companies, this guidance is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods, but may be adopted earlier. We are currently evaluating the impact that the adoption of this standard will have on our Consolidated Financial Statements.