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Income Taxes - Reconciliation from Federal Statutory Tax Rate to Effective Tax Rate (Details) |  | 6 Months Ended | 12 Months Ended
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Jan. 01, 2018 | Dec. 31, 2017 | Jun. 24, 2018 | Jun. 25, 2017 | Jun. 26, 2016
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] |  |  |  |  |
Federal statutory tax rate | 21.00% | 35.00% | 28.30% | 35.00% | 35.00%
Foreign income taxed at different rates |  |  | (2.40%) | (10.20%) | (7.70%)
Repatriation of foreign earnings and withholding taxes |  |  | 1.80% | 1.40% | (1.00%)
Repatriation of foreign earnings due to tax reform |  |  | 23.90% |  |
Revaluation of U.S. deferred balances due to tax reform |  |  | (14.20%) |  |
Change in valuation allowance |  |  | (12.90%) | (0.50%) | (3.70%)
Foreign tax credits |  |  | (11.00%) |  |
Domestic production activities deduction |  |  | 0.50% | 2.00% | (0.50%)
Research and other credits |  |  | (1.80%) | (5.10%) | 4.80%
State income taxes, net of federal tax benefit |  |  | (3.90%) | 0.20% | 1.50%
Change in uncertain tax positions |  |  | (15.10%) | 1.80% | 1.20%
Nondeductible compensation |  |  | 1.60% |  |
Nondeductible expenses and other |  |  | 0.30% | 0.60% | 1.60%
Effective tax rate |  |  | (4.90%) | 25.20% | 31.20%

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