Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to Masonite	$ 57,037	$ 37,691	$ 183,134	$ 119,718
Shares used in computing basic earnings per share	22,267,684	24,068,744	22,624,830	24,329,647
Effect of dilutive securities:
Incremental shares issuable under share compensation plans	224,190	357,649	248,197	389,971
Shares used in computing diluted earnings per share	22,491,874	24,426,393	22,873,027	24,719,618
Basic earnings per common share attributable to Masonite (in dollars per share)	$ 2.56	$ 1.57	$ 8.09	$ 4.92
Diluted earnings per common share attributable to Masonite (in dollars per share)	$ 2.54	$ 1.54	$ 8.01	$ 4.84
Stock Appreciation Rights (SARs)
Effect of dilutive securities:
Anti-dilutive instruments excluded from diluted earnings per common share (in shares)	212,197	31,530	223,660	31,530