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Commitments and Contingencies - Litigation (Details)
6 Months Ended 17 Months Ended
Sep. 05, 2017
plaintiff
Jan. 09, 2017
claim
Apr. 16, 2015
claim
Sep. 30, 2018
claim
Dec. 15, 2009
claim
plaintiff
Sep. 24, 2014
claim
Sep. 23, 2014
claim
Sep. 07, 2010
claim
Jul. 02, 2010
claim
Former stockholder litigation                  
Loss Contingencies [Line Items]                  
Loss contingencies, number of plaintiffs | plaintiff         6        
Loss contingencies, new claims filed, number         9        
Loss contingencies, claims amended, number           1   1 3
Loss contingencies, claims dismissed, number   1   3          
Loss contingency, claims amended, number of claims consolidated           2 2    
Loss contingencies, claims settled, number     1            
Former stockholder litigation | United States District Court for Southern District of New York                  
Loss Contingencies [Line Items]                  
Loss contingencies, pending claims, number               3  
United States District Court for the Eastern District of Virginia styled Langley v. Booz Allen Hamilton Holding Corp.                  
Loss Contingencies [Line Items]                  
Loss contingencies, number of plaintiffs | plaintiff 2