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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2024 | Oct. 01, 2023 | Sep. 29, 2024 | Oct. 01, 2023
Revenue from Contract with Customer [Abstract] |  |  |  |
Contract assets, net change |  |  | $ 6.0 |
Contract liabilities, net change |  |  | (39.9) |
Revenue recognized | $ 10.6 | $ 9.5 | $ 79.8 | $ 43.1

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- Definition Contract With Customer, Asset, Increase (Decrease) + References No definition available. + Details
Name: | ktos_ContractWithCustomerAssetIncreaseDecrease
Namespace Prefix: | ktos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract With Customer, Liability, Increase (Decrease) + References No definition available. + Details
Name: | ktos_ContractWithCustomerLiabilityIncreaseDecrease
Namespace Prefix: | ktos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration