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Business Overview (Details) | 9 Months Ended
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Jun. 30, 2015 employee business_area location | Jun. 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 | 1,200 |
Minimum number of locations in which entity operates (location) | location | 25 |
Number of broad integrated revenue streams | 2 |
US Government [Member] | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 100.00% | 100.00%
DVA | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 95.00% | 97.00%
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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