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REVENUES - Schedule of Changes in Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Contract With Customer Liability [Roll Forward]
Contract liabilities, beginning of year	$ 206,867	$ 216,160
Customer advances received or billed, net	105,777	138,865
Recognition of unearned revenue	(89,212)	(131,593)
Contract liabilities, end of year	$ 223,432	$ 223,432

X

- Definition

Contract With Customer Liability Current Additions

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer Liability Revenue Recognized Excluding Opening Balance

+ References

No definition available.

+ Details

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Namespace Prefix:	rklb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer Liability

+ References

No definition available.

+ Details

Name:	rklb_ContractWithCustomerLiabilityRollForward
Namespace Prefix:	rklb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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Period Type:	instant