Goodwill and Intangible Assets (Goodwill) (Details) $ in Thousands	3 Months Ended
	Jan. 02, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 101,817
Translation adjustments and other	(1,642)
Goodwill, end of period	100,175
Commercial Lasers and Components
Goodwill [Roll Forward]
Goodwill, beginning of period	6,363
Translation adjustments and other	0
Goodwill, end of period	6,363
Specialty Laser Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	95,454
Translation adjustments and other	(1,642)
Goodwill, end of period	$ 93,812