v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
May 08, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Entity Registrant Name Hostess Brands, Inc.  
Entity Central Index Key 0001644406  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Common Class A    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   101,301,842
Common Class B    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   28,999,784