| Cover Page | Nov. 04, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 4, 2019 |
| Entity Registrant Name | Masonite International Corporation |
| Entity Incorporation, State or Country Code | A1 |
| Entity File Number | 001-11796 |
| Entity Tax Identification Number | 98-0377314 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000893691 |
