Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
3 Months Ended
Dec. 31, 2019
Feb. 04, 2020
Document and Entity Information [Abstract]    
Entity Registrant Name UNION ACQUISITION CORP. II  
Entity Central Index Key 0001766146  
Amendment Flag false  
Current Fiscal Year End Date --09-30  
Document Type 10-Q  
Document Period End Date Dec. 31, 2019  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Shell Company true  
Entity Emerging Growth Company true  
Entity Common Stock, Shares Outstanding   25,000,000
Entity File Number 001-38563  
Entity Interactive Data Current Yes  
Entity Ex Transition period false  
Entity Incorporation State Country Code E9