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Earnings Per Share - Net Income Available to Shareholders to Compute Basic and Diluted EPS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income attributable to Parsons Corporation	$ 47,447	$ 29,571	$ 116,241	$ 68,533
Convertible senior notes if-converted method interest adjustment	559	545	1,665	1,627
Diluted net income attributable to Parsons Corporation	$ 48,006	$ 30,116	$ 117,906	$ 70,160

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- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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