Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Deferred tax assets:
Compensation related	$ 12,328	$ 4,744
Pension and post-retirement benefits	88,709	48,716
Inventory reserves	14,732	15,166
Accrued liabilities and reserves	22,049	17,321
Warranty reserves	17,890	16,550
Operating lease liability	16,180	17,521
Interest Rate Swaps	12,997	6,075
Net operating loss carryforwards	20,747	17,873
Other	17,187	16,504
Gross deferred tax assets	222,819	160,470
Valuation allowance	(11,731)	(7,754)
Deferred tax assets	211,088	152,716
Deferred tax liabilities:
Intangible assets	(226,598)	(203,721)
Depreciable assets	(26,916)	(18,020)
Operating lease right-of-use assets	(15,921)	(17,542)
Other	(12,825)	(10,001)
Deferred Tax Liabilities, Gross	282,260	249,284
Deferred tax liabilities	(71,172)	(96,568)
Deferred Income Tax Assets, Net	76,052	36,932
Deferred Income Tax Liabilities, Net	$ (147,224)	$ (133,500)