Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Deferred tax assets:
Federal net operating loss carryforwards	$ 20,430	$ 28,079
Compensation related	18,654	12,474
Accrued retirement benefits	8,780	5,228
Inventory reserves	4,611	4,429
Product liability and workers compensation reserves	5,052	4,295
Warranty reserves	4,490	4,175
Receivable related reserves	2,350	2,509
UNICAP	2,138	1,984
Accrued plant closure		868
State net operating loss carryforwards	580	740
Interest rate swap	1,114	676
Other	10,802	8,805
Gross deferred tax assets	79,001	74,262
Valuation allowance
Deferred tax assets	79,001	74,262
Deferred tax liabilities:
Intangible assets	(69,998)	(55,901)
Foreign tax earnings repatriation	(1,546)	(2,266)
LIFO reserves	(161)	(583)
Depreciation	(2,547)	(497)
Other	(3,504)	(1,353)
Deferred tax liabilities	(77,756)	(60,600)
Net deferred tax assets (liabilities)	1,245	13,662
Current deferred asset (liability)	39,090	25,520
Long-term deferred asset (liability)	(37,845)	(11,858)
Net deferred tax assets (liabilities)	$ 1,245	$ 13,662