Cover Page - shares	3 Months Ended
	Mar. 31, 2021	May 17, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	Juniper Industrial Holdings, Inc.
Entity Central Index Key	0001787791
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Incorporation, State or Country Code	DE
Entity Address, Country	JE
Class A Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Shares of Class A common stock included as part of the units
Trading Symbol	JIH
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		34,500,000
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,625,000
Capital Units Redeemable Warrant [Member]
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-half of one redeemable warrant
Trading Symbol	JIH.U
Security Exchange Name	NYSE
Warrant [Member]
Document Information [Line Items]
Title of 12(b) Security	Warrants included as part of the units, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50
Trading Symbol	JIH WS
Security Exchange Name	NYSE