Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 51,668	$ 102,808
Short-term investments	1,200	7,421
Accounts receivable, net	60,760	36,986
Inventories:
Raw materials and purchased parts	29,430	37,140
Work in process	18,065	14,958
Finished goods	11,482	10,234
Total inventories	58,977	62,332
Deferred income taxes	5,516	4,746
Other current assets	8,727	6,790
Total current assets	186,848	221,083
Property, plant and equipment, at cost:
Land and land improvements	12,285	12,106
Buildings and building improvements	32,211	31,209
Machinery and equipment	44,532	40,108
Property plant and equipment, gross	89,028	83,423
Less accumulated depreciation and amortization	(52,802)	(47,959)
Net property, plant and equipment	36,226	35,464
Goodwill	71,313	58,756
Intangible assets, net	45,315	18,977
Other assets	5,721	593
Total consolidated assets	345,423	334,873
Current liabilities:
Accounts payable	26,023	13,217
Accrued compensation and benefits	15,050	10,271
Accrued warranty	5,252	4,692
Deferred profit	6,066	2,139
Income taxes payable	805	1,109
Other accrued liabilities	7,815	4,952
Total current liabilities	61,011	36,380
Accrued retirement benefits	10,841	3,729
Noncurrent income tax liabilities	7,463	2,118
Deferred income taxes	12,948	11,747
Commitments and contingencies
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued
Common stock, $1 par value; 60,000 shares authorized, 25,080 shares issued and outstanding in 2013 and 24,632 shares in 2012	25,080	24,632
Paid-in capital	89,883	83,547
Retained earnings	131,546	170,937
Accumulated other comprehensive income	6,651	1,783
Total stockholders' equity	253,160	280,899
Total liabilities and stockholders' equity	$ 345,423	$ 334,873