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Cover Page Document - USD ($)
$ in Billions
 12 Months Ended
Dec. 29, 2019
Feb. 17, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 29, 2019    
Document Transition Report false    
Entity File Number 001-11796    
Entity Registrant Name Masonite International Corporation    
Entity Tax Identification Number 98-0377314    
Entity Incorporation, State or Country Code A1    
Entity Address, Address Line One 2771 Rutherford Road    
Entity Address, City or Town Concord    
Entity Address, State or Province ON    
Entity Address, Postal Zip Code L4K 2N6    
Entity Address, Country CA    
City Area Code 800    
Local Phone Number 895-2723    
Title of 12(b) Security Common Stock (no par value)    
Trading Symbol DOOR    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
Entity Public Float     $ 1.3
Entity Bankruptcy Proceedings, Reporting Current true    
Entity Common Stock, Shares Outstanding   24,931,203  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for its 2020 Annual General Meeting of Shareholders scheduled to be held on May 14, 2020, to be filed with the Securities and Exchange Commission not later than 120 days after December 29, 2019, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K.
    
Entity Central Index Key 0000893691    
Current Fiscal Year End Date --12-29    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false