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v3.25.3

Inventory - Narrative (Details) $ in Thousands | 3 Months Ended
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Sep. 26, 2025 USD ($)
Inventory Disclosure [Abstract] |
Inventory reclassified | $ 4,444

X
- Definition Inventory Reclassified + References No definition available. + Details
Name: | mrcy_InventoryReclassified
Namespace Prefix: | mrcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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