Business Combinations and Acquisitions	6 Months Ended
Jun. 27, 2021
Business Combination and Asset Acquisition [Abstract]
Business Combinations and Acquisitions	Business Combinations and AcquisitionsAs described in Note 1 - “Description of Business,” the Business Combination was consummated on February 10, 2020. For financial accounting and reporting purposes under U.S. GAAP, the Business Combination was accounted for as a reverse acquisition and recapitalization, with no goodwill or other intangible asset recorded. Under this method of accounting, Gores III (legal acquirer) is treated as the acquired entity and Shay (legal acquiree) is deemed to have issued common stock for the net assets and equity of Gores III consisting of mainly cash, accompanied simultaneously by the Recapitalization. The net assets of Gores III are stated at historical cost, and accordingly the equity and net assets of Shay have not been adjusted to fair value. Consequently, the consolidated assets, liabilities and results of operations of Shay are the historical financial statements of PAE Incorporated and the Gores III assets, liabilities and results of operations are consolidated with the assets, liabilities and results of operations of Shay beginning on the Closing Date. Shares and earnings per share information prior to the Business Combination have been retroactively restated to reflect the exchange ratio established in the Recapitalization. Other than professional fees paid to consummate the transaction, the Business Combination primarily involved the exchange of cash and equity between Gores III, Shay and the stockholders of the respective companies. The aggregate proceeds paid to the Shay Stockholders (as defined below) on the Closing Date was approximately $424.2 million. The remainder of the consideration paid to the Shay Stockholders consisted of 21,127,823 newly issued shares of Class A Common Stock of PAE Incorporated, par value $0.0001 per share (“Class A Common Stock”). In addition to the foregoing consideration paid on the Closing Date, former stockholders of Shay are entitled to receive additional Earn-Out Shares from PAE of up to an aggregate of 4,000,000 shares of Class A Common Stock if the price of Class A Common Stock trading on the Nasdaq exceeds certain thresholds during the five-year period following the completion of the Business Combination. See Note 11 - “Stockholders’ Equity - Earn-Out Agreement” for additional information. The Company also has certain warrants issued by Gores III that remain outstanding after the Business Combination. In connection with the Business Combination, the Company recorded $18.2 million, net of tax as a reduction to additional paid in capital related to the transaction costs. These costs were directly attributable to the Recapitalization. In addition, the Company recorded $3.4 million of transaction costs related to the warrants as non-operating expense in the consolidated statement of operations. During the third quarter of 2020, pursuant to the post-closing adjustment provisions contained in the Merger Agreement, the Company made a post-closing adjustment payment of $20.2 million to the Shay Stockholders. In addition, the Company paid $1.0 million to certain members of PAE management in connection with the post-closing adjustment, and such amount was recorded as compensation expense. CENTRA Technology, Inc. On November 20, 2020, the Company acquired 100% of the capital stock of CENTRA Technology, Inc. (“CENTRA”) for a consideration paid of $225.3 million, net. The results of CENTRA’s operations have been included in the Company’s condensed consolidated financial statements since that date. This business combination expands and differentiates PAE's capabilities in intelligence analysis, communication systems integration and research and development services for intelligence and defense customers. During the second quarter of 2021, the Company made a payment of $1.4 million related to the working capital adjustment, pursuant to the Stock Purchase Agreement (as defined below). The Company has completed the purchase accounting valuation for this acquisition and recorded final purchase accounting adjustments. As a result, the Company recognized fair values of assets acquired of $177.4 million and assumed liabilities of $77.2 million allocating $126.4 million to goodwill and $74.1 million to intangible assets. The goodwill of $126.4 million arising from the acquisition relates primarily to revenue and cost synergies. This goodwill is not deductible for tax purposes. Metis Solutions Corporation On November 23, 2020, the Company completed the acquisition of 100% of the capital stock of Metis Solutions Corporation (“Metis”) for a consideration paid of $95.7 million in cash. The results of Metis’s operations have been included in the condensed consolidated financial statements since that date. This business combination expands and differentiates PAE's capabilities in intelligence analysis, training and program support for intelligence and defense customers. During the second quarter of 2021, pursuant to the purchase price adjustment provisions of the Metis Merger Agreement (as defined below), the Company made a payment of $0.5 million to the option holders as a result of a closing adjustment. The Company has completed the purchase accounting valuation for this acquisition and recorded final purchase accounting adjustments. As a result, the Company recognized fair values of assets acquired of $60.4 million and assumed liabilities of $20.7 million allocating $56.5 million to goodwill and $37.8 million to intangible assets. The goodwill of $56.5 million arising from the acquisition relates primarily to revenue and cost synergies. This goodwill is not deductible for tax purposes.

Other than professional fees paid to consummate the transaction, the Business Combination primarily involved the exchange of cash and equity between Gores III, Shay and the stockholders of the respective companies. The aggregate proceeds paid to the Shay Stockholders (as defined below) on the Closing Date was approximately $424.2 million. The remainder of the consideration paid to the Shay Stockholders consisted of 21,127,823 newly issued shares of Class A Common Stock of PAE Incorporated, par value $0.0001 per share (“Class A Common Stock”).

In addition to the foregoing consideration paid on the Closing Date, former stockholders of Shay are entitled to receive additional Earn-Out Shares from PAE of up to an aggregate of 4,000,000 shares of Class A Common Stock if the price of Class A Common Stock trading on the Nasdaq exceeds certain thresholds during the five-year period following the completion of the Business Combination. See Note 11 - “Stockholders’ Equity - Earn-Out Agreement” for additional information.

The Company also has certain warrants issued by Gores III that remain outstanding after the Business Combination.

In connection with the Business Combination, the Company recorded $18.2 million, net of tax as a reduction to additional paid in capital related to the transaction costs. These costs were directly attributable to the Recapitalization. In addition, the Company recorded $3.4 million of transaction costs related to the warrants as non-operating expense in the consolidated statement of operations.

During the third quarter of 2020, pursuant to the post-closing adjustment provisions contained in the Merger Agreement, the Company made a post-closing adjustment payment of $20.2 million to the Shay Stockholders. In addition, the Company paid $1.0 million to certain members of PAE management in connection with the post-closing adjustment, and such amount was recorded as compensation expense.

On November 20, 2020, the Company acquired 100% of the capital stock of CENTRA Technology, Inc. (“CENTRA”) for a consideration paid of $225.3 million, net. The results of CENTRA’s operations have been included in the Company’s condensed consolidated financial statements since that date. This business combination expands and differentiates PAE's capabilities in intelligence analysis, communication systems integration and research and development services for intelligence and defense customers.

During the second quarter of 2021, the Company made a payment of $1.4 million related to the working capital adjustment, pursuant to the Stock Purchase Agreement (as defined below).

The Company has completed the purchase accounting valuation for this acquisition and recorded final purchase accounting adjustments. As a result, the Company recognized fair values of assets acquired of $177.4 million and assumed liabilities of $77.2 million allocating $126.4 million to goodwill and $74.1 million to intangible assets. The goodwill of $126.4 million arising from the acquisition relates primarily to revenue and cost synergies. This goodwill is not deductible for tax purposes.

On November 23, 2020, the Company completed the acquisition of 100% of the capital stock of Metis Solutions Corporation (“Metis”) for a consideration paid of $95.7 million in cash. The results of Metis’s operations have been included in the condensed consolidated financial statements since that date. This business combination expands and differentiates PAE's

During the second quarter of 2021, pursuant to the purchase price adjustment provisions of the Metis Merger Agreement (as defined below), the Company made a payment of $0.5 million to the option holders as a result of a closing adjustment.

The Company has completed the purchase accounting valuation for this acquisition and recorded final purchase accounting adjustments. As a result, the Company recognized fair values of assets acquired of $60.4 million and assumed liabilities of $20.7 million allocating $56.5 million to goodwill and $37.8 million to intangible assets. The goodwill of $56.5 million arising from the acquisition relates primarily to revenue and cost synergies. This goodwill is not deductible for tax purposes.