Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 46,248	$ 102,808	[1]
Short-term investments	6,609	7,421	[1]
Accounts receivable, net	58,167	36,986	[1]
Inventories:
Raw materials and purchased parts	30,981	37,140	[1]
Work in process	17,864	14,958	[1]
Finished goods	11,516	10,234	[1]
Total inventories	60,361	62,332	[1]
Deferred income taxes	5,908	4,746	[1]
Other current assets	6,565	6,790	[1]
Total current assets	183,858	221,083	[1]
Property, plant and equipment, at cost:
Land and land improvements	12,210	12,106	[1]
Buildings and building improvements	31,813	31,209	[1]
Machinery and equipment	43,311	40,108	[1]
Property plant and equipment, gross	87,334	83,423	[1]
Less accumulated depreciation and amortization	(51,419)	(47,959)	[1]
Net property, plant and equipment	35,915	35,464	[1]
Goodwill	70,895	58,756	[1]
Intangible assets, net	46,682	18,977	[1]
Other assets	3,770	593	[1]
Total consolidated assets	341,120	334,873	[1]
Current liabilities:
Accounts payable	18,760	13,217	[1]
Accrued compensation and benefits	15,993	10,271	[1]
Accrued warranty	5,106	4,692	[1]
Deferred profit	5,482	2,139	[1]
Income taxes payable	1,515	1,109	[1]
Other accrued liabilities	8,301	4,952	[1]
Total current liabilities	55,157	36,380	[1]
Other accrued liabilities	17,495	5,847	[1]
Deferred income taxes	12,283	11,747	[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, 24,942 shares issued and outstanding in 2013 and 24,632 shares in 2012	24,942	24,632	[1]
Paid-in capital	88,099	83,547	[1]
Retained earnings	139,500	170,937	[1]
Accumulated other comprehensive income	3,644	1,783	[1]
Total stockholders' equity	256,185	280,899	[1]
Total liabilities and stockholders' equity	$ 341,120	$ 334,873	[1]

[1] Derived from December 29, 2012 audited financial statements