Business Combinations (Details) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 30, 2012 USD ($) projects	Jul. 31, 2015 USD ($)	Dec. 29, 2012 USD ($)	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)	Jul. 24, 2015 USD ($)	Dec. 20, 2012 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill				$ 101,817	$ 109,513	$ 113,408
Gain on business combination				$ (1,316)	$ 0	0
Innolight innovative [Member]
Business Acquisition [Line Items]
Expensed acquisition-related costs						200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Tangible assets	$ 2,510
Goodwill	8,312
Deferred tax liabilities	(3,836)
Liabilities assumed	(480)
Business Acquisition, Cost of Acquired Entity, Cash Paid	18,336
Innolight innovative [Member] | Minimum
Business Acquisition [Line Items]
Acquired identifiable intangible assets, useful lives				6 years
Innolight innovative [Member] | Maximum
Business Acquisition [Line Items]
Acquired identifiable intangible assets, useful lives				7 years
Innolight innovative [Member] | Existing technology
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 8,500
Innolight innovative [Member] | In Process Research and Development [Member]
Business Acquisition [Line Items]
Business Acquisition, Number of Projects Acquired | projects	2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 430
Innolight innovative [Member] | Trade name
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets	100
Innolight innovative [Member] | Customer lists
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 2,800
Lumera [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory								$ 7,364
Expensed acquisition-related costs						$ 600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Accounts Receivable, Net, Current								2,770
Other Assets, Current								4,380
Goodwill								24,640
Deferred tax liabilities								(9,300)
Liabilities assumed								(8,793)
Business Acquisition, Cost of Acquired Entity, Cash Paid			$ 51,461
Lumera [Member] | Minimum
Business Acquisition [Line Items]
Acquired identifiable intangible assets, useful lives				1 year
Lumera [Member] | Maximum
Business Acquisition [Line Items]
Acquired identifiable intangible assets, useful lives				6 years
Lumera [Member] | Existing technology
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets								21,000
Lumera [Member] | In Process Research and Development [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets								1,800
Lumera [Member] | Trade name
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets								200
Lumera [Member] | Customer lists
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets								6,500
Lumera [Member] | Order or Production Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets								$ 900
Raydianceinc [Member]
Business Acquisition [Line Items]
Expensed acquisition-related costs				$ 100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Tangible assets				1,481
Goodwill							$ 1,119
Business Acquisition, Cost of Acquired Entity, Cash Paid		$ 5,000		$ 5,000
Raydianceinc [Member] | Minimum
Business Acquisition [Line Items]
Acquired identifiable intangible assets, useful lives				3 years
Raydianceinc [Member] | Maximum
Business Acquisition [Line Items]
Acquired identifiable intangible assets, useful lives				5 years
Raydianceinc [Member] | Existing technology
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets							800
Raydianceinc [Member] | Customer lists
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Intangible assets							$ 1,600
Tinsley [Member]
Business Acquisition [Line Items]
Expensed acquisition-related costs				$ 400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Inventory, Net
Deferred tax liabilities				$ (768)
Liabilities assumed				(1,702)
Business Acquisition, Cost of Acquired Entity, Cash Paid		$ 4,300		4,300
Gain on business combination				(1,316)
Tinsley [Member] [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory				2,263
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets				1,132
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				2,451
Accounts Receivable, Net, Current				$ 2,240