Acquisitions - Integral Systems, Inc. (Details) (USD $)	3 Months Ended		6 Months Ended							0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011	Dec. 25, 2011	Jun. 24, 2012 Senior notes Senior Notes due June 2017	Jul. 27, 2011 Senior notes Senior Notes due June 2017	Mar. 25, 2011 Senior notes Senior Notes due June 2017	May 19, 2010 Senior notes Senior Notes due June 2017	Jul. 27, 2011 Integral Systems, Inc.	Jun. 24, 2012 Integral Systems, Inc.	Jun. 24, 2012 Integral Systems, Inc.	Jul. 27, 2011 Integral Systems, Inc. Senior notes Senior Notes due June 2017
Business Acquisition, Cost of Acquired Entity [Abstract]
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	631,200,000		631,200,000		631,800,000	625,000,000	115,000,000	285,000,000	225,000,000				115,000,000
Stated interest rate percentage						10.00%							10.00%
Effective interest rate							8.90%	8.50%					8.90%
Proceeds from issuance of senior notes, gross													120,800,000
Long-term debt premium	20,800,000		20,800,000		22,800,000		5,800,000	20,000,000					5,800,000
Accrued interest													1,800,000
Issuance premium, percentage													105.00%
Cash received by each Integral Systems stockholder										5
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 exhange terms										$ 13
Integral Systems stock options amount of cash condition for calculating consideration										13
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										13
Number of years in business										30 years
Business Combination, Acquired Receivables [Abstract]
Acquired accounts receivable, gross										68,500,000
Acquired accounts receivable, estimated uncollectible										(100,000)
Revenues	219,800,000	171,100,000	429,300,000	293,900,000							50,900,000	400,000
Operating income (loss)	$ 7,400,000	$ 8,700,000	$ 16,500,000	$ 10,100,000							$ 94,900,000	$ 2,200,000