Debt Instrument, Early Termination Fee

No definition available.

Name:	ktos_DebtInstrumentEarlyTerminationFee
Namespace Prefix:	ktos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Escrow Interest

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Facility Fixed Coverage Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	ktos_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Portion of Aggregate Principal Amount Available for Redemption

+ References

No definition available.

+ Details

Name:	ktos_DebtInstrumentPortionOfAggregatePrincipalAmountAvailableForRedemption
Namespace Prefix:	ktos_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of aggregate principal amount that may be redeemed by the Company if certain terms are met

+ References

No definition available.

+ Details

Name:	ktos_DebtInstrumentRedemptionAmountAsPercentageOfAggregatePrincipalAmount
Namespace Prefix:	ktos_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Redemption Price As A Percentage of Aggregate Principal Amount

+ References

No definition available.

+ Details

Name:	ktos_DebtInstrumentRedemptionPriceAsPercentageOfAggregatePrincipalAmount
Namespace Prefix:	ktos_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

Name:	us-gaap_DebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
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Period Type:

Debt - Issuance of 7.00% Senior Secured Notes due 2019 (Details) (USD $)	3 Months Ended	12 Months Ended			0 Months Ended	1 Months Ended
	Sep. 28, 2014	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	May 14, 2014	May 31, 2014	May 04, 2012	Sep. 17, 2014
Debt Instrument [Line Items]
Principal		$ (669,800,000.0)us-gaap_DebtInstrumentFaceAmount	$ (629,800,000.0)us-gaap_DebtInstrumentFaceAmount
Proceeds from the issuance of long-term debt, net of issuance costs		618,500,000	0	0
Original issue discount		5,800,000
Unamortized premium		0	14,500,000
Loss on extinguishment of debt	39,100,000	39,100,000	0	0
Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings		41,000,000
Maximum borrowing capacity					110,000,000.0		110,000,000.0
Fixed charge coverage ratio		1.15
Senior notes \| 7% Senior Notes due 2019
Debt Instrument [Line Items]
Stated interest rate percentage		7.00%			7.00%			7.00%
Principal		(625,000,000)				(625,000,000.0)
Proceeds from the issuance of long-term debt, net of issuance costs					618,500,000
Original issue discount					6,500,000
Debt Issuance Cost					8,700,000
Fixed charge coverage ratio						2.0
Senior notes \| 7% Senior Notes due 2019 \| Between 5/15/2016 and 5/15/2017
Debt Instrument [Line Items]
Redemption amount as percentage of aggregate principle amount		105.25%
Senior notes \| 7% Senior Notes due 2019 \| Between 5/15/2017 and 5/15/2018
Debt Instrument [Line Items]
Redemption amount as percentage of aggregate principle amount		102.625%
Senior notes \| 7% Senior Notes due 2019 \| After 5/15/2018
Debt Instrument [Line Items]
Redemption amount as percentage of aggregate principle amount		100.00%
Senior notes \| 7% Senior Notes due 2019 \| Before 5/15/2016
Debt Instrument [Line Items]
Redemption amount as percentage of aggregate principle amount		107.00%
Redemption amount as percentage of available aggregate principle amount		35.00%
Redemption price as percentage of aggregate principal amount		100.00%
Senior notes \| 7% Senior Notes due 2019 \| One Time Before 5/15/2016
Debt Instrument [Line Items]
Redemption amount as percentage of aggregate principle amount		10.00%
Redemption price as percentage of aggregate principal amount		103.00%
Senior notes \| 10% Senior Notes due June 2017
Debt Instrument [Line Items]
Stated interest rate percentage						10.00%
Principal						(625,000,000.0)
Reacquisition price						661,500,000
Early Termination Fee						31,200,000
Write off of unamortized issue costs						15,500,000
Unamortized premium						12,900,000
Interest accrued in escrow						5,300,000
Loss on extinguishment of debt						$ 39,100,000