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Discontinued Operations - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 28, 2017 | Jan. 01, 2017 | Dec. 29, 2017 | Dec. 30, 2016 | Dec. 29, 2017 | Dec. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income from sale of discontinued operations per diluted share (in dollars per share) |  |  | $ 0.00 | $ 0.10 | $ (0.05) | $ 0.23
IT Services | Critical Networks | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net | $ 646 |  |  |  |  |
Pre-tax gain (loss) on sale of discontinued operations, before tax | (28) |  |  |  |  |
Gain on sale of discontinued operations, net of tax | $ 55 |  |  |  |  |
Income from sale of discontinued operations per diluted share (in dollars per share) | $ 0.44 |  |  |  |  |
Discontinued operations, period of continuing involvement after disposal | 18 months |  |  |  |  |
CapRock | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net |  | $ 368 |  |  |  |
Pre-tax gain (loss) on sale of discontinued operations, before tax |  | 14 |  |  |  |
Gain on sale of discontinued operations, net of tax |  | $ 61 |  |  |  |
Income from sale of discontinued operations per diluted share (in dollars per share) |  | $ 0.49 |  |  |  |

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