Cover Page - shares
6 Months Ended
Jun. 30, 2019
Aug. 07, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 001-37540  
Entity Registrant Name HOSTESS BRANDS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-4168492  
Entity Address, Address Line One 1 East Armour Boulevard  
Entity Address, City or Town Kansas City,  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 64111  
City Area Code 816  
Local Phone Number 701‑4600  
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 Shell Company false  
Amendment Flag false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001644406  
Current Fiscal Year End Date --12-31  
Common Class A    
Class of Stock [Line Items]    
Title of 12(b) Security Class A Common Stock, Par Value of $0.0001 per share  
Trading Symbol TWNK  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   109,323,871
Class of Stock [Line Items]    
Title of 12(b) Security Warrants, each exercisable for a half share of Class A Common Stock  
Trading Symbol TWNKW  
Security Exchange Name NASDAQ  
Common Class B    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   20,999,784