Business Combinations	12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]
Business Combinations	Business Combinations 2016 Business Combinations During the third quarter of 2016, we completed the acquisition of Kanjoya, Inc. ("Kanjoya"), a California corporation (the “Kanjoya Acquisition”), located in San Francisco, California. During the second quarter of 2016, we completed the acquisition of substantially all of the assets of Capital Analytics, Inc. (d/b/a Vestrics) (hereinafter referred to as "Vestrics") (the “Vestrics Acquisition”), a Delaware limited liability company located in North Carolina. The Kanjoya Acquisition and the Vestrics Acquisition (the “2016 Acquisitions”) were deemed insignificant to the audited consolidated financial statements on an individual basis and in the aggregate. Acquisition of Kanjoya, Inc. On September 29, 2016, pursuant to a merger agreement with Kanjoya, we acquired Kanjoya in exchange for $19.6 million, of which $16.9 million was paid in cash during the twelve months ended December 31, 2016 while the remaining $2.6 million is being held in escrow, and is included in accrued liabilities on our consolidated balance sheet. We recorded the Kanjoya Acquisition using the acquisition method of accounting and recognized assets and liabilities assumed at their fair value as of the date of acquisition. Based on the valuation, the significant classes of assets and liabilities to which we allocated the purchase price of Kanjoya were acquired intangibles for a total of $13.6 million, consisting of $12.1 million for developed technology, $1.5 million for customer relationships, and goodwill for the balance of $6.4 million. Pursuant to the Kanjoya Acquisition we assumed working capital, net, totaling $0.4 million. The fair value of the acquired developed technology was estimated using the cost approach. In accordance with GAAP, direct costs related to the acquisition were expensed as incurred. Kanjoya is a leading cloud workforce intelligence provider for enterprises. Based upon the technology acquired, we launched UltiPro Perception, a feature-set that enables businesses to identify and analyze attitudes and performance traits of their employees, managers, and teams from surveys and other sources of employee feedback. Kanjoya's workforce has joined Ultimate and will serve to establish an additional research and development hub for us in San Francisco. The results of operations from this acquisition have been included in our consolidated financial statements since the closing of the Kanjoya Acquisition. Pro forma results of operations have not been presented because the effects of this business combination were not deemed significant to our audited consolidated results of operations. Acquisition of Capital Analytics, Inc., d/b/a Vestrics On May 11, 2016 (the "Vestrics Closing Date"), pursuant to an asset purchase agreement with Vestrics, we acquired certain assets and liabilities in exchange for $10.1 million, of which $1.0 million and $9.1 million was paid in cash during the years ended December 31, 2017 and 2016, respectively. We recorded the Vestrics Acquisition using the acquisition method of accounting and recognized assets and liabilities assumed at their fair value as of the date of acquisition. The valuation of Vestrics has been completed and the significant classes of assets and liabilities to which we allocated the purchase price were goodwill of $4.3 million (which includes working capital, net, totaling $0.2 million, which was assumed pursuant to the Vestrics Acquisition) and identifiable intangible assets of $6.0 million related to developed technology. In accordance with GAAP, direct costs related to the acquisition were expensed as incurred. Vestrics’ predictive technology enables a company to identify and analyze the connections between its investments in human capital and the performance-related business results of those investments. We will leverage Vestrics’ technology as we continue to expand our analytics capabilities across UltiPro. The fair value of the acquired developed technology was estimated using the cost approach. Identifiable intangible assets were assigned a total weighted-average amortization period of 7.0 years. Since the developed predictive technology acquired pursuant to the Vestrics Acquisition will be included in the Development Project currently being capitalized as internal-use software to be offered as a cloud product in the future, amortization of the Vestrics developed technology will begin when it is ready for its intended use. The results of operations from this acquisition have been included in our audited consolidated financial statements since the Vestrics Closing Date. Pro forma results of operations have not been presented because the effects of this business combination were not deemed significant to our audited consolidated results of operations.

Business Combinations

2016 Business Combinations

During the third quarter of 2016, we completed the acquisition of Kanjoya, Inc. ("Kanjoya"), a California corporation (the “Kanjoya Acquisition”), located in San Francisco, California. During the second quarter of 2016, we completed the acquisition of substantially all of the assets of Capital Analytics, Inc. (d/b/a Vestrics) (hereinafter referred to as "Vestrics") (the “Vestrics Acquisition”), a Delaware limited liability company located in North Carolina. The Kanjoya Acquisition and the Vestrics Acquisition (the “2016 Acquisitions”) were deemed insignificant to the audited consolidated financial statements on an individual basis and in the aggregate.

Acquisition of Kanjoya, Inc.

On September 29, 2016, pursuant to a merger agreement with Kanjoya, we acquired Kanjoya in exchange for $19.6 million, of which $16.9 million was paid in cash during the twelve months ended December 31, 2016 while the remaining $2.6 million is being held in escrow, and is included in accrued liabilities on our consolidated balance sheet. We recorded the Kanjoya Acquisition using the acquisition method of accounting and recognized assets and liabilities assumed at their fair value as of the date of acquisition. Based on the valuation, the significant classes of assets and liabilities to which we allocated the purchase price of Kanjoya were acquired intangibles for a total of $13.6 million, consisting of $12.1 million for developed technology, $1.5 million for customer relationships, and goodwill for the balance of $6.4 million. Pursuant to the Kanjoya Acquisition we assumed working capital, net, totaling $0.4 million. The fair value of the acquired developed technology was estimated using the cost approach. In accordance with GAAP, direct costs related to the acquisition were expensed as incurred. Kanjoya is a leading cloud workforce intelligence provider for enterprises. Based upon the technology acquired, we launched UltiPro Perception, a feature-set that enables businesses to identify and analyze attitudes and performance traits of their employees, managers, and teams from surveys and other sources of employee feedback. Kanjoya's workforce has joined Ultimate and will serve to establish an additional research and development hub for us in San Francisco.

The results of operations from this acquisition have been included in our consolidated financial statements since the closing of the Kanjoya Acquisition. Pro forma results of operations have not been presented because the effects of this business combination were not deemed significant to our audited consolidated results of operations.

Acquisition of Capital Analytics, Inc., d/b/a Vestrics

On May 11, 2016 (the "Vestrics Closing Date"), pursuant to an asset purchase agreement with Vestrics, we acquired certain assets and liabilities in exchange for $10.1 million, of which $1.0 million and $9.1 million was paid in cash during the years ended December 31, 2017 and 2016, respectively. We recorded the Vestrics Acquisition using the acquisition method of accounting and recognized assets and liabilities assumed at their fair value as of the date of acquisition. The valuation of Vestrics has been completed and the significant classes of assets and liabilities to which we allocated the purchase price were goodwill of $4.3 million (which includes working capital, net, totaling $0.2 million, which was assumed pursuant to the Vestrics Acquisition) and identifiable intangible assets of $6.0 million related to developed technology. In accordance with GAAP, direct costs related to the acquisition were expensed as incurred. Vestrics’ predictive technology enables a company to identify and analyze the connections between its investments in human capital and the performance-related business results of those investments. We will leverage Vestrics’ technology as we continue to expand our analytics capabilities across UltiPro. The fair value of the acquired developed technology was estimated using the cost approach. Identifiable intangible assets were assigned a total weighted-average amortization period of 7.0 years. Since the developed predictive technology acquired pursuant to the Vestrics Acquisition will be included in the Development Project currently being capitalized as internal-use software to be offered as a cloud product in the future, amortization of the Vestrics developed technology will begin when it is ready for its intended use.

The results of operations from this acquisition have been included in our audited consolidated financial statements since the Vestrics Closing Date. Pro forma results of operations have not been presented because the effects of this business combination were not deemed significant to our audited consolidated results of operations.