Document and Entity Information - shares	3 Months Ended
	Mar. 27, 2020	May 01, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 27, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Trading Symbol	ICHR
Entity Registrant Name	ICHOR HOLDINGS, LTD.
Entity Central Index Key	0001652535
Current Fiscal Year End Date	--12-27
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Ordinary Shares Outstanding		22,808,456
Title of 12(b) Security	Ordinary Shares, par value $0.0001
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-37961
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	3185 Laurelview Ct.
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94538
City Area Code	510
Local Phone Number	897-5200
Document Quarterly Report	true
Document Transition Report	false