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Business Segment, Customer And Geographic Information (Revenue By Customer Sector) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2009 | Sep. 30, 2009 | Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2009
Revenue | $ 963,162 | $ 913,369 | $ 867,278 | $ 833,971 | $ 848,717 | $ 784,169 | $ 776,727 | $ 739,518 | $ 3,577,780 | $ 3,149,131 | $ 2,730,162 | [1]
Revenue percentage | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% | 100.00% |
Department Of Defense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,858,721 | 2,450,463 | 2,078,338 |
Revenue percentage | 79.90% |  |  |  | 77.80% |  |  |  | 79.90% | 77.80% | 76.10% |
Federal Civilian Agencies [member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 537,687 | 535,467 | 542,090 |
Revenue percentage | 15.00% |  |  |  | 17.00% |  |  |  | 15.00% | 17.00% | 19.90% |
Commercial And Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 166,966 | 146,839 | 88,228 |
Revenue percentage | 4.70% |  |  |  | 4.70% |  |  |  | 4.70% | 4.70% | 3.20% |
State And Local Governments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 14,406 | $ 16,362 | $ 21,506 |
Revenue percentage | 0.40% |  |  |  | 0.50% |  |  |  | 0.40% | 0.50% | 0.80% |
[1] | Certain amounts for the year ended June 30, 2009 have been adjusted to reflect the retroactive application of new accounting standards. See Note 3.

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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