Acquisitions - Integral Systems, Inc. (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended				0 Months Ended	12 Months Ended	0 Months Ended
	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011	Jul. 27, 2011 Senior notes Senior Notes due June 2017	Mar. 25, 2011 Senior notes Senior Notes due June 2017	Dec. 29, 2013 Senior notes Senior Notes due June 2017	May 19, 2010 Senior notes Senior Notes due June 2017	Jul. 27, 2011 Integral Systems, Inc.	Dec. 25, 2011 Integral Systems, Inc.	Jul. 27, 2011 Integral Systems, Inc. Senior notes Senior Notes due June 2017
Business Acquisition [Line Items]
Purchase price																$ 241,100,000
Aggregate amount of cash paid																131,400,000
Common stock issued in acquisition, shares																10,400,000
Common stock issued in acquisition, fair value																108,700,000
Replacement stock options issued, fair value																1,000,000
Principal	629,800,000				630,700,000				629,800,000	630,700,000		115,000,000	285,000,000	625,000,000	225,000,000			115,000,000.0
Stated interest rate percentage												10.00%	10.00%	10.00%	10.00%			10.00%
Issuance premium, percentage																		105.00%
Effective interest rate												8.90%	8.50%					8.90%
Proceeds from issuance of senior notes, gross												122,500,000	314,000,000					120,800,000
Long-term debt premium	14,500,000				18,700,000				14,500,000	18,700,000		5,800,000	20,000,000					5,800,000
Accrued interest												1,700,000	9,000,000					1,800,000
Amount of cash received by each stockholder of Integral (in dollars per share)																$ 5.00
Number of Kratos shares received by each Integral Systems stockholder for one share of Integral Systems common stock																0.588
Integral Systems stock options exercise price cutoff for exchange terms (in dollars per share)																$ 13.00
Conversion to Kratos stock options ratio																0.9559
Amount of cash received by each Integral Systems stockholder for each share of Integral Systems restricted stock (in dollars per share)																$ 13.00
Number of years in business																30 years
Revenues									100,900,000	116,200,000	54,300,000						87,300,000
Operating income (loss)	$ 5,400,000	$ 6,100,000	$ 8,900,000	$ 11,400,000	$ (80,300,000)	$ 14,100,000	$ 7,400,000	$ 9,100,000	$ 31,800,000	$ (49,700,000)	$ 29,500,000						$ 7,100,000