Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Components of Income from Continuing Operations before Provision for Income Taxes [Abstract]
Domestic	$ 8,913,000	$ 11,445,000	$ 9,823,000
Foreign	24,113,000	24,485,000	28,320,000
Total income from continuing operations before provision for income taxes	33,026,000	35,930,000	38,143,000
Current Provision [Abstract]
Federal	1,986,000	1,798,000	123,000
Foreign	7,955,000	7,363,000	5,575,000
State	436,000	559,000	473,000
Current provision (benefit)	10,377,000	9,720,000	6,171,000
Deferred (Benefit) Provision [Abstract]
Federal	1,325,000	(3,980,000)	(317,000)
Foreign	(2,354,000)	(782,000)	(1,309,000)
State	(32,000)	(106,000)	(260,000)
Deferred (benefit) provision	(1,061,000)	(4,868,000)	(1,886,000)
Provision for income taxes from continuing operations	9,316,000	4,852,000	4,285,000
Provision for Income Taxes Including Discontinued Operation [Abstract]
Continuing operations	9,316,000	4,852,000	4,285,000
Discontinued operation	(34,000)	451,000	(1,511,000)
Provision for income taxes including discontinued operation	9,282,000	5,303,000	2,774,000
Tax benefits related to employees' and directors' stock plans	351,000	132,000	371,000
Federal statutory income tax rate (in hundredths)	35.00%
Tax Reconciliation From Statutory Rate to Effective Rate [Abstract]
Provision for Income Taxes at Statutory Rate	11,559,000	12,576,000	13,350,000
Increases (Decreases) Resulting From [Abstract]
State income taxes, net of federal tax	304,000	295,000	(140,000)
U.S. tax (benefit) cost of foreign earnings	(119,000)	791,000	(53,000)
Foreign tax rate differential	(2,681,000)	(2,298,000)	(3,094,000)
Provision (reversal) of tax benefit reserves, net	853,000	624,000	(1,596,000)
Change in valuation allowance	(968,000)	(7,051,000)	(4,183,000)
Nondeductible expenses	1,580,000	775,000	746,000
Research and development tax credits	(638,000)	(623,000)	(324,000)
Other	(574,000)	(237,000)	(421,000)
Provision for income taxes from continuing operations	9,316,000	4,852,000	4,285,000
Deferred Tax (Liability) Asset [Abstract]
Foreign and alternative minimum tax credit carryforwards	3,819,000	5,659,000
Reserves and accruals	5,125,000	6,493,000
Net operating loss carryforwards	16,452,000	15,147,000
Inventory basis difference	2,797,000	2,468,000
Research and development	1,017,000	1,193,000
Employee compensation	3,199,000	2,229,000
Allowance for doubtful accounts	595,000	486,000
Revenue recognition	253,000	286,000
Other	209,000	88,000
Deferred tax asset, gross	33,466,000	34,049,000
Less: valuation allowance	(13,905,000)	(14,315,000)
Deferred tax asset, net	19,561,000	19,734,000
Goodwill and intangible assets	(20,923,000)	(15,393,000)
Fixed asset basis difference	(3,619,000)	(2,974,000)
Reserves and accruals	(207,000)	(342,000)
Other	(65,000)	(107,000)
Deferred tax liability	(24,814,000)	(18,816,000)
Net Deferred Tax (Liability) Asset	(5,253,000)	918,000
Valuation Allowance [Line Items]
Decrease in valuation allowance	410,000
Undistributed earnings of foreign subsidiaries [Abstract]
Undistributed earnings of foreign subsidiaries	145,926,000
Withholding liability related to undistributed earnings of foreign subsidiaries	2,000,000
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefits which, if recognized, would reduce the effective tax rate	5,423,000
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits, beginning of year	4,194,000	3,308,000
Gross increases - tax positions in prior periods	449,000	185,000
Gross decreases - tax positions in prior periods	0	(41,000)
Gross increases - current period tax positions	1,086,000	1,231,000
Settlements	(6,000)	(182,000)
Lapses of statutes of limitations	(158,000)	(367,000)
Currency translation	(142,000)	60,000
Unrecognized tax benefits, end of year	5,423,000	4,194,000	3,308,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Income tax interest and penalties accrued	1,776,000	1,196,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]
Expense (benefit) from income tax penalties and interest expense	205,000	(6,000)
Significant change in unrecognized tax benefits is reasonably possible, estimated time frame	12 months
Maximum significant change in liability for unrecognized tax benefits is reasonably possible, decrease	842,000
Research and Development Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	467,000
Alternative Minimum Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	1,154,000
Domestic State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	28,963,000
Foreign Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance	12,955,000
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	59,708,000
Operating loss carryforwards expiring in 2014 through 2032	11,790,000
U.S. Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance	950,000
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 2,182,000