Segment Information (Reconciliation of Consolidated Adjusted EBITDA to Net Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Segment Reporting [Abstract]
Adjusted EBITDA	$ 61,414	$ 52,594
Depreciation	13,934	14,024
Amortization	6,585	5,970
Share based compensation expense	3,065	2,427
Loss (gain) on disposal of property, plant and equipment	612	(274)
Restructuring costs, net	0	293
Interest expense (income), net	8,756	7,024
Other expense (income), net	(272)	(514)
Income tax expense (benefit)	6,701	(1,679)
Loss (income) from discontinued operations, net of tax	250	245
Net income (loss) attributable to non-controlling interest	957	1,513
Net income (loss) attributable to Masonite	$ 20,826	$ 23,565