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v3.22.2.2

Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) | 12 Months Ended
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Jul. 01, 2022
Maximum |
Restricted Cash and Cash Equivalents Items [Line Items] |
Maturity of cash and cash equivalents | 90 days

X
- Definition Represents the maximum original maturity period of investments classified as cash and cash equivalents at the date of acquisition. + References No definition available. + Details
Name: | mrcy_CashAndCashEquivalentMaturityPeriod
Namespace Prefix: | mrcy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |