Document and Entity Information - shares |
6 Months Ended | |
|---|---|---|
Sep. 30, 2017 |
Nov. 01, 2017 |
|
| Document and Entity Information [Abstract] | ||
| Entity Registrant Name | Booz Allen Hamilton Holding Corp | |
| Entity Central Index Key | 0001443646 | |
| Document Type | 10-Q | |
| Document Period End Date | Sep. 30, 2017 | |
| Amendment Flag | false | |
| Document Fiscal Year Focus | 2018 | |
| Document Fiscal Period Focus | Q2 | |
| Current Fiscal Year End Date | --03-31 | |
| Entity Filer Category | Large Accelerated Filer | |
| Common stock, Class A | ||
| Entity Listings [Line Items] | ||
| Entity Common Stock, Shares Outstanding | 145,812,022 | |
| Non-voting common stock, Class B | ||
| Entity Listings [Line Items] | ||
| Entity Common Stock, Shares Outstanding | 0 | |
| Restricted common stock, Class C | ||
| Entity Listings [Line Items] | ||
| Entity Common Stock, Shares Outstanding | 0 | |
| Special voting common stock, Class E | ||
| Entity Listings [Line Items] | ||
| Entity Common Stock, Shares Outstanding | 0 |