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Business Overview (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | 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) |  |  | 1,200
Minimum number of locations in which entity operates (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%
DVA | Revenue concentration | Customer concentration |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (percent) | 96.00% | 97.00% | 96.00%
DVA | Minimum |  |  |
Concentration Risk [Line Items] |  |  |
Term of government contract |  |  | 2 years
DVA | Maximum |  |  |
Concentration Risk [Line Items] |  |  |
Term of government contract |  |  | 4 years

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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