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Business Overview (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2015 employee location business_area | Sep. 30, 2014
Concentration Risk [Line Items] |  |  |  |
Minimum period for which entity has provided professional services to the U.S. Government (years) |  |  | 25 years |
Number of employees (employee) | employee |  |  | 1,250 |
Minimum number of locations in which entity operates (location) | location |  |  | 30 |
Number of broad integrated revenue streams | business_area |  |  | 2 |
US Government [Member] | Revenue concentration | Customer concentration |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (percent) |  |  | 100.00% |
DVA | Revenue concentration | Customer concentration |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (percent) | 96.00% | 97.00% | 95.00% | 96.00%
DVA | Minimum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Term of government contract |  |  | 1 year |
DVA | Maximum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Term of government contract |  |  | 3 years |

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