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	Sep. 30, 2012 Senior notes Senior Notes due June 2017	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	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