Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Net long-term deferred tax liabilities:
Compensation	$ 5,304	$ 5,399	$ 4,367
Stock-based compensation	8,911	7,069	5,582
Accrued post-retirement benefit obligations	5,972	5,918	5,749
OCI tax effected items	1,230	2,585	2,159
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	2,723	2,565	2,536
Other - net	2,349	3,362	3,501
Total long-term deferred tax assets	26,489	26,898	23,894
Goodwill	(74,436)	(66,127)	(56,878)
Tax over book depreciation	(20,081)	(12,720)	(6,300)
Total long-term deferred tax liabilities	(94,517)	(78,847)	(63,178)
Valuation allowance	(936)	(919)	(950)
Total net long-term deferred tax liabilities	68,964	52,868	40,234
Net current deferred tax assets:
Allowance for doubtful accounts	1,859	1,233	1,691
Vacation accrual	3,706	3,920	3,078
Inventory differences	3,695	3,660	3,676
Marketing accrual	1,317	1,348	1,323
Warranty accrual	2,412	2,022	2,212
Compensation	7,821	5,609	5,532
Other - net	7,371	7,042	4,300
Total current deferred tax assets	28,181	24,834	21,812
Deferred income	(4,148)	(3,949)	(3,933)
Prepaids	(7,339)	(812)	(952)
Total current deferred tax liabilities	(11,487)	(4,761)	(4,885)
Valuation allowance	(643)	(661)	(666)
Total net current deferred tax assets	16,051	19,412	16,261
Net deferred tax (liabilities) assets	$ (52,913)	$ (33,456)	$ (23,973)