Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 40,043	$ 51,668	[1]
Short-term investments	1,075	1,200	[1]
Accounts receivable, net	66,962	60,760	[1]
Inventories:
Raw materials and purchased parts	25,710	29,430	[1]
Work in process	24,439	18,065	[1]
Finished goods	12,305	11,482	[1]
Total inventories	62,454	58,977	[1]
Deferred income taxes	5,658	5,516	[1]
Other current assets	9,867	8,727	[1]
Total current assets	186,059	186,848	[1]
Property, plant and equipment, at cost:
Land and land improvements	12,285	12,285	[1]
Buildings and building improvements	32,438	32,211	[1]
Machinery and equipment	44,724	44,532	[1]
Property plant and equipment, gross	89,447	89,028	[1]
Less accumulated depreciation and amortization	(53,787)	(52,802)	[1]
Net property, plant and equipment	35,660	36,226	[1]
Goodwill	71,375	71,313	[1]
Intangible assets, net	43,391	45,315	[1]
Other assets	5,609	5,721	[1]
Total consolidated assets	342,094	345,423	[1]
Current liabilities:
Accounts payable	26,947	26,023	[1]
Accrued compensation and benefits	14,674	15,050	[1]
Accrued warranty	4,914	5,252	[1]
Deferred profit	6,331	6,066	[1]
Income taxes payable	846	805	[1]
Other accrued liabilities	7,862	7,815	[1]
Total current liabilities	61,574	61,011	[1]
Accrued retirement benefits	10,979	10,841	[1]
Noncurrent income tax liabilities	7,488	7,463	[1]
Deferred income taxes	12,666	12,948	[1]
Commitments and contingencies			[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued			[1]
Common stock, $1 par value; 60,000 shares authorized, 25,248 shares issued and outstanding in 2014 and 25,080 shares in 2013	25,248	25,080	[1]
Paid-in capital	90,467	89,883	[1]
Retained earnings	126,692	131,546	[1]
Accumulated other comprehensive income	6,980	6,651	[1]
Total stockholders' equity	249,387	253,160	[1]
Total liabilities and stockholders' equity	$ 342,094	$ 345,423	[1]

[1] Derived from December 28, 2013 audited financial statements