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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, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 912,931 | $ 906,196 | $ 931,627 | $ 931,236 | $ 948,873 | $ 927,962 | $ 973,243 | $ 924,395 | $ 3,681,990 | $ 3,774,473 | $ 3,577,780
Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,681,990 | 3,774,473 | 3,577,780
Revenue percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Department Of Defense [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,735,102 | 2,944,924 | 2,858,721
Revenue percentage |  |  |  |  |  |  |  |  | 74.30% | 78.00% | 79.90%
Federal Civilian Agencies [member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 741,053 | 620,870 | 537,687
Revenue percentage |  |  |  |  |  |  |  |  | 20.10% | 16.50% | 15.00%
Commercial And Other [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 190,142 | 193,840 | 166,966
Revenue percentage |  |  |  |  |  |  |  |  | 5.20% | 5.10% | 4.70%
State And Local Governments [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 15,693 | $ 14,839 | $ 14,406
Revenue percentage |  |  |  |  |  |  |  |  | 0.40% | 0.40% | 0.40%

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