Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 02, 2024
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Period End Date	Mar. 31, 2024
Document Fiscal Period Focus	Q1
Entity Registrant Name	ROCKET LAB USA, INC.
Entity Central Index Key	0001819994
Securities Act File Number	001-39560
Entity Incorporation, State or Country Code	DE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Tax Identification Number	98-1550340
Entity Address, Address Line One	3881 McGowen Street
Entity Address, City or Town	Long Beach
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90808
City Area Code	714
Local Phone Number	465-5737
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		492,779,716
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	RKLB
Security Exchange Name	NASDAQ