Segment Information (Reconciliation of Consolidated Adjusted EBITDA to Net Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Net income attributable to Masonite	$ 1,602	$ 14,969	$ 24,242	$ 3,789	$ 12,347	$ 24,796	$ 34,741	$ 20,826	$ 44,602	$ 92,710	$ 151,739
Depreciation									70,736	59,089	57,528
Amortization									29,113	28,583	24,375
Share based compensation expense									10,023	7,681	11,644
Loss on disposal of property, plant and equipment									6,396	3,470	1,893
Restructuring costs	2,681	1,994	1,361	3,740	1,624	0	0	0	9,776	1,624	850
Asset impairment	0	0	3,142	10,625	5,243	0	0	0	13,767	5,243	0
Loss on disposal of subsidiaries	9,655	0	0	4,605					14,260	0	212
Interest expense, net	12,096	11,909	11,357	11,127	11,027	10,151	9,074	8,756	46,489	39,008	30,153
Loss on extinguishment of debt	0	(14,523)	0	0	0	5,414	0	0	14,523	5,414	0
Other expense (income), net	(4,363)	824	456	1,130	724	948	839	22	(1,953)	2,533	1,570
Income tax expense (benefit)	2,624	4,334	10,293	58	3,067	6,151	7,894	6,701	17,309	23,813	(27,560)
Net income attributable to non-controlling interest	$ 1,272	$ 1,126	$ 849	$ 1,190	$ 1,176	$ 748	$ 953	$ 957	4,437	3,834	5,242
Adjusted EBITDA									$ 283,384	$ 267,936	$ 254,506