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BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION - Revenue by Customer Sector (Detail 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,170,086 | $ 1,124,100 | $ 1,087,860 | $ 1,085,814 | $ 1,137,389 | $ 1,086,418 | $ 1,057,530 | $ 1,073,280 | $ 4,467,860 | $ 4,354,617 | $ 3,744,053
Customer Information | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4,467,860 | $ 4,354,617 | $ 3,744,053
Percentage of revenue |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Customer Information | Department of Defense | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 2,974,578 | $ 2,829,305 | $ 2,439,329
Percentage of revenue |  |  |  |  |  |  |  |  | 66.60% | 65.00% | 65.10%
Customer Information | Federal civilian agencies | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 1,201,874 | $ 1,259,212 | $ 1,062,508
Percentage of revenue |  |  |  |  |  |  |  |  | 26.90% | 28.90% | 28.40%
Customer Information | Commercial and other | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 291,408 | $ 266,100 | $ 242,216
Percentage of revenue |  |  |  |  |  |  |  |  | 6.50% | 6.10% | 6.50%
[1] | Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

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