Segment Information - Sales and Income (Loss) from Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 02, 2016	Dec. 27, 2014
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent	$ 27,283	$ 24,309
Nonoperating Income (Expense)	(222)	(685)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	27,061	23,624
Provision for income taxes	6,775	6,194
Net sales	190,275	200,615
Net income	20,286	17,430
Other Operating Income (Expense), Net	(222)	(685)
Income before income taxes	27,061	23,624
Specialty Laser Systems
Segment Reporting Information [Line Items]
Net sales	135,951	145,091
Income (loss) from operations	35,795	34,554
Commercial Lasers and Components
Segment Reporting Information [Line Items]
Net sales	54,324	55,524
Income (loss) from operations	1,815	703
Corporate and other
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (10,327)	$ (10,948)