Acquisitions - Pro Forma Financial Information (Details) (Composite Engineering, Inc., USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Composite Engineering, Inc.
Business Acquisition [Line Items]
Pro forma revenues	$ 754.3
Pro forma net loss before tax	(27.6)
Pro forma net loss	(31.4)
Net loss attributable to the registrant	$ (21.8)
Basic and diluted pro forma loss per share (in dollars per share)	$ (0.46)

Business Acquisition Pro Forma Income (Loss) From Continuing Operations Before Income Taxes

No definition available.

Name:	ktos_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeIncomeTaxes
Namespace Prefix:	ktos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Business Acquisition, Pro Forma Net Income (Loss) Attributable to Parent

+ References

No definition available.

+ Details

Name:	ktos_BusinessAcquisitionProFormaNetIncomeLossAvailableToCommonStockholdersBasic
Namespace Prefix:	ktos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration