Goodwill and Intangible Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 04, 2015
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 109,513
Translation adjustments and other	(10,125)
Goodwill, end of period	99,388
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	103,150
Translation adjustments and other	(10,125)
Goodwill, end of period	$ 93,025