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Inventory - Narrative (Details) $ in Thousands	3 Months Ended
	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