Operating Income from Continuing Operations by Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Operating Income
Operating Income	$ 6,480	$ 5,390	$ 10,548	$ 6,852
Laser Products
Operating Income
Operating Income	6,847	5,441	13,971	10,134
Medical Technologies
Operating Income
Operating Income	38	399	(79)	1,844
Precision Motion
Operating Income
Operating Income	4,086	4,420	6,729	6,434
Corporate, Shared Services and Unallocated
Operating Income
Operating Income	$ (4,491)	$ (4,870)	$ (10,073)	$ (11,560)