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Summary of Significant Accounting Policies Update - Information regarding significant accounting policies (Details) | 9 Months Ended | 12 Months Ended
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Sep. 29, 2018 | Dec. 30, 2017
U. S. Government |  |
Revenue Recognition |  |
Revenues From Contracts With U. S. Government, Percentage |  | 24.00%
U. S. Government | Maximum |  |
Revenue Recognition |  |
Percentage of contract price received for performance based payments on US Government Contracts | 90.00% |
Percentage of costs incurred representing progress payments on US Government Contracts | 80.00% |
U. S. Government | Fixed-price and fixed-price incentive contracts |  |
Revenue Recognition |  |
Percentage of revenue under fixed-price and fixed-price incentive contracts |  | 80.00%
Commercial Contract | Minimum |  |
Revenue Recognition |  |
Period of warranty programs | 1 year |
Commercial Contract | Maximum |  |
Revenue Recognition |  |
Period of warranty programs | 5 years |

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