Segment Information (Reconciliation of Consolidated Adjusted EBITDA to Net Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Segment Reporting [Abstract]
Adjusted EBITDA	$ 69,706	$ 65,107	$ 191,102	$ 191,864
Depreciation	14,174	13,995	43,475	43,378
Amortization	6,216	6,217	17,782	19,199
Share based compensation expense	2,740	3,412	8,694	11,922
Loss (gain) on disposal of property, plant and equipment	1,388	698	1,529	1,090
Restructuring costs, net	1,393	215	986	131
Loss (gain) on disposal of subsidiaries	0	(5,144)	212	(6,575)
Interest expense (income), net	7,213	6,985	21,349	21,150
Other expense (income), net	(186)	(1,199)	(457)	(1,214)
Income tax expense (benefit)	5,989	6,526	13,242	15,591
Loss (income) from discontinued operations, net of tax	139	236	518	608
Net income (loss) attributable to non-controlling interest	1,162	1,157	3,845	3,392
Net income (loss) attributable to Masonite	$ 29,478	$ 32,009	$ 79,927	$ 83,192