Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Compensation related	$ 4,744	$ 3,776
Pension and post-retirement benefits	48,716	41,502
Inventory reserves	15,166	14,441
Accrued liabilities and reserves	17,321	13,835
Warranty reserves	16,550	10,641
Operating lease liability	17,521	0
Net operating loss carryforwards	17,873	36,629
Other	22,579	10,531
Gross deferred tax assets	160,470	131,355
Valuation allowance	(7,754)	(26,023)
Deferred tax assets	152,716	105,332
Deferred tax liabilities:
Intangible assets	(203,721)	(167,197)
Depreciable assets	(18,020)	(13,617)
Operating lease right-of-use assets	(17,542)	0
Other	(10,001)	(6,226)
Deferred tax liabilities	(249,284)	(187,040)
Deferred Income Tax Liabilities, Net	(96,568)	(81,708)
Long-term deferred liability	36,932	32,188
Deferred Tax Liabilities, Net, Noncurrent	$ (133,500)	$ (113,896)