CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Sales	$ 96,905	$ 79,769	$ 176,038	$ 154,840
Cost of sales	58,254	46,530	105,282	90,970
Gross profit	38,651	33,239	70,756	63,870
Operating expenses:
Research and development and engineering	7,525	6,115	13,382	11,931
Selling, general and administrative	21,410	19,374	41,028	38,063
Amortization of purchased intangible assets	2,876	1,617	4,620	3,853
Restructuring and acquisition related costs	360	743	1,178	3,171
Total operating expenses	32,171	27,849	60,208	57,018
Operating income from continuing operations	6,480	5,390	10,548	6,852
Interest income (expense), net	(1,375)	(921)	(2,212)	(1,819)
Foreign exchange transaction gains (losses), net	(61)	(459)	(80)	760
Other income (expense), net	419	293	1,000	662
Income from continuing operations before income taxes	5,463	4,303	9,256	6,455
Income tax provision	2,057	3,018	2,994	3,421
Income from continuing operations	3,406	1,285	6,262	3,034
Loss from discontinued operations, net of tax	(2,678)	(1,827)	(4,544)	(1,458)
Loss on disposal of discontinued operations, net of tax		(311)		(311)
Consolidated net income (loss)	728	(853)	1,718	1,265
Less: Net income attributable to noncontrolling interest	(3)	(18)	(10)	(54)
Net income (loss) attributable to GSI Group Inc.	$ 725	$ (871)	$ 1,708	$ 1,211
Earnings per common share from continuing operations:
Basic	$ 0.10	$ 0.03	$ 0.18	$ 0.08
Diluted	$ 0.10	$ 0.03	$ 0.18	$ 0.08
Loss per common share from discontinued operations:
Basic	$ (0.08)	$ (0.06)	$ (0.13)	$ (0.05)
Diluted	$ (0.08)	$ (0.06)	$ (0.13)	$ (0.05)
Earnings (loss) per common share attributable to GSI Group Inc.:
Basic	$ 0.02	$ (0.03)	$ 0.05	$ 0.03
Diluted	$ 0.02	$ (0.03)	$ 0.05	$ 0.03
Weighted average common shares outstanding-basic	34,378	34,088	34,304	34,036
Weighted average common shares outstanding-diluted	34,707	34,285	34,690	34,279