Accrued Expenses (Detail) (USD $) In Thousands	Oct. 01, 2011	Jan. 01, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued payroll and related expenses	$ 31,612	$ 32,625
Accrued customer rebates	16,322	18,086
Advanced customer deposits	15,371	13,357
Accrued warranty	14,973	14,468
Accrued product liability and workers compensation	11,347	9,711
Accrued agent commission	7,687	7,824
Accrued professional services	5,998	5,944
Other accrued expenses	27,456	23,795
Accrued Liabilities, Current, Total	$ 130,766	$ 125,810