Goodwill and Intangible Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 29, 2012
Goodwill [Line Items]
Goodwill, Acquired During Period	$ 32,881
Goodwill [Roll Forward]
Goodwill, beginning of period	77,689
Translation adjustments and other	1,054
Goodwill, end of period	111,624
Commercial Lasers and Components
Goodwill [Line Items]
Goodwill, Acquired During Period	0
Goodwill [Roll Forward]
Goodwill, beginning of period	6,363
Translation adjustments and other	0
Goodwill, end of period	6,363
Specialty Laser Systems
Goodwill [Line Items]
Goodwill, Acquired During Period	32,881
Goodwill [Roll Forward]
Goodwill, beginning of period	71,326
Translation adjustments and other	1,054
Goodwill, end of period	$ 105,261