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Income Taxes - Summary of Differences Between U.S. Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
U.S. federal statutory tax rate | 21.00% | 35.00% | 21.00% | 35.00% | 35.00%
State income taxes (net of federal benefit) | 2.20% | 1.80% | 2.30% | 2.40% |
Cessation of operations | 0.00% | 0.40% | (1.60%) | (16.00%) |
Research and development credit | (0.10%) | (1.10%) | (0.40%) | (2.20%) |
Tax (windfall) shortfall on share-based awards | (4.50%) | (0.80%) | (18.90%) | 0.80% |
Section 162m limitation | 0.20% | 0.00% | 0.30% | 0.00% |
Increase in valuation allowance due to net operating loss | 0.10% | 0.10% | 0.40% | 1.20% |
Impact of Foreign Ops | 2.30% | 0.40% | 2.30% | 0.70% |
Other | 0.70% | 0.70% | 0.80% | 1.30% |
Total effective tax rate | 21.90% | 36.50% | 6.20% | 23.20% |

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