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Summary of Significant Accounting Policies - Accounts Receivable Factoring (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 28, 2024 | Jun. 30, 2023 | Jun. 21, 2023 | Mar. 14, 2023 | Sep. 27, 2022
Accounting Policies [Abstract] |  |  |  |  |
Limit on purchased receivables |  |  | $ 60 | $ 30,600 | $ 20
Factored amount | $ 33,777 | $ 30,488 |  |  |
Factoring fees | $ 1,947 | $ 562 |  |  |

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- Definition Accounts Receivable, Amount Factored + References No definition available. + Details
Name: | mrcy_AccountsReceivableAmountFactored
Namespace Prefix: | mrcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable, Factoring Fees + References No definition available. + Details
Name: | mrcy_AccountsReceivableFactoringFees
Namespace Prefix: | mrcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Receivables Purchase Agreement, Limit On Purchased Receivables + References No definition available. + Details
Name: | mrcy_ReceivablesPurchaseAgreementLimitOnPurchasedReceivables
Namespace Prefix: | mrcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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