Significant Customers	9 Months Ended
Sep. 29, 2013
Segment Reporting [Abstract]
Significant Customers	Significant Customers Revenue from the U.S. Government, which includes foreign military sales, includes revenue from contracts for which the Company is the prime contractor as well as those for which the Company is a subcontractor and the ultimate customer is the U.S. Government. The KGS segment has substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $162.9 million and $143.4 million or 59% and 63% of total Kratos revenue for the three months ended September 30, 2012 and September 29, 2013, respectively, and approximately $443.8 million and $460.9 million, or 63% and 64%, of total revenue for the nine months ended September 30, 2012 and September 29, 2013, respectively. The U.S. Government continues to focus on developing and implementing spending, tax, and other initiatives to reduce the deficit, create jobs, and stimulate the economy. Although defense spending is expected to remain a national priority within future federal budgets, the Budget Control Act of 2011 (“Budget Control Act”) committed the U.S. Government to reduce the federal deficit over the following ten years. Under the Budget Control Act, the Bi-Partisan Congressional Joint Select Committee on Deficit Reduction (“the Joint Committee”) was responsible for identifying $1.2 to $1.5 trillion in deficit reductions by November 30, 2011. The Joint Committee was unable to identify the reductions by this deadline and thereby triggered a provision of the Budget Control Act called “sequestration,” which requires very substantial automatic spending cuts that have started in 2013, are split between defense and non-defense programs, and continue over a nine-year period. On April 10, 2013, the President delivered his proposed Fiscal Year ("FY") 2014 budget to Congress. The President's $527 billion FY 2014 defense budget is slightly lower than final defense appropriations for FY 2013. While it largely reflects defense spending plans in the FY 2013 budget, it does not reflect the reductions mandated by Part II of the Budget Control Act. On October 17, 2013 HR. 2775 the “Continuing Appropriations Act of 2014” was signed into law by the President, extending the debt ceiling through February 7, 2014 and temporarily restoring funding for government agencies. The legislation funds federal agencies only until January 15, 2014, and at the FY 2013 enacted levels, which reflect the first sequestration cuts that took effect in March and a discretionary funding level of $986 billion, the amount available to the appropriators to fund FY 2014 federal government programs. There continues to be uncertainty in how sequestration will ultimately be implemented, and there are many variables in how the law could be applied that make it difficult to determine the specific impacts. Any automatic reductions in national defense programs could impact the Company's significant customers, which in turn could impact the Company's business and financial results.

Significant Customers

Revenue from the U.S. Government, which includes foreign military sales, includes revenue from contracts for which the Company is the prime contractor as well as those for which the Company is a subcontractor and the ultimate customer is the U.S. Government. The KGS segment has substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $162.9 million and $143.4 million or 59% and 63% of total Kratos revenue for the three months ended September 30, 2012 and September 29, 2013, respectively, and approximately $443.8 million and $460.9 million, or 63% and 64%, of total revenue for the nine months ended September 30, 2012 and September 29, 2013, respectively.

The U.S. Government continues to focus on developing and implementing spending, tax, and other initiatives to reduce the deficit, create jobs, and stimulate the economy. Although defense spending is expected to remain a national priority within future federal budgets, the Budget Control Act of 2011 (“Budget Control Act”) committed the U.S. Government to reduce the federal deficit over the following ten years. Under the Budget Control Act, the Bi-Partisan Congressional Joint Select Committee on Deficit Reduction (“the Joint Committee”) was responsible for identifying $1.2 to $1.5 trillion in deficit reductions by November 30, 2011. The Joint Committee was unable to identify the reductions by this deadline and thereby triggered a provision of the Budget Control Act called “sequestration,” which requires very substantial automatic spending cuts that have started in 2013, are split between defense and non-defense programs, and continue over a nine-year period.

On April 10, 2013, the President delivered his proposed Fiscal Year ("FY") 2014 budget to Congress. The President's $527 billion FY 2014 defense budget is slightly lower than final defense appropriations for FY 2013. While it largely reflects defense spending plans in the FY 2013 budget, it does not reflect the reductions mandated by Part II of the Budget Control Act. On October 17, 2013 HR. 2775 the “Continuing Appropriations Act of 2014” was signed into law by the President, extending the debt ceiling through February 7, 2014 and temporarily restoring funding for government agencies. The legislation funds federal agencies only until January 15, 2014, and at the FY 2013 enacted levels, which reflect the first sequestration cuts that took effect in March and a discretionary funding level of $986 billion, the amount available to the appropriators to fund FY 2014 federal government programs. There continues to be uncertainty in how sequestration will ultimately be implemented, and there are many variables in how the law could be applied that make it difficult to determine the specific impacts. Any automatic reductions in national defense programs could impact the Company's significant customers, which in turn could impact the Company's business and financial results.