CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Sales	$ 78,807	$ 91,858
Cost of goods sold	46,035	51,964
Gross profit	32,772	39,894
Operating expenses:
Research and development and engineering	7,435	8,171
Selling, general and administrative	18,957	19,268
Amortization of purchased intangible assets	662	992
Restructuring, restatement related costs and other	2,667	183
Post-emergence professional fees		139
Total operating expenses	29,721	28,753
Income from operations	3,051	11,141
Interest income	21	20
Interest expense	(828)	(3,670)
Foreign exchange transaction losses, net	(790)	(692)
Other income (expense), net	188	1,030
Income from operations before income taxes	1,642	7,829
Income tax provision	243	1,567
Consolidated net income	1,399	6,262
Less: Net income attributable to noncontrolling interest	(18)	(55)
Net income attributable to GSI Group Inc.	$ 1,381	$ 6,207
Earnings per common share attributable to GSI Group Inc.:
Basic	$ 0.04	$ 0.19
Diluted	$ 0.04	$ 0.19
Weighted average common shares outstanding-basic	33,679	33,449
Weighted average common shares outstanding-diluted	33,878	33,532