Acquisitions (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 27, 2014	Dec. 28, 2013	Jun. 28, 2014
Business Acquisition [Line Items]
Number of Businesses Acquired	0		2
Business Acquisition, Share Price		$ 23
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill	$ 595,441,000		$ 596,637,000
Volterra [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 01, 2013
Business Combination, Acquisition Related Costs			7,000,000
Payments to Acquire Businesses, Gross		593,250,000
Business Acquisition, Cash Paid for Employee's Vested Options		21,756,000
Business Combination, Consideration Transferred		615,006,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Cash and Equivalents		163,500,000
Business Combination, Receivables		23,453,000
Business Combination, Inventory		33,339,000
Business Combination, Other Noncurrent Assets		17,151,000
Business Combination, Accrued Liabilities		(35,343,000)
Business Combination, Income Tax Payable		(23,241,000)
Business Combination, Current Liabilities, Other		(20,149,000)
Business Combination, Assets Acquired and Liabilities Assumed, Net		158,710,000
Business Combination, Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		226,900,000
Business Combination, Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		56,200,000
Goodwill		174,894,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		(1,698,000)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		615,006,000
Volterra [Member] | Intellectual property [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years 10 months 24 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		192,500,000
Volterra [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 years 7 months 6 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		24,600,000
Volterra [Member] | Tradename [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		6,400,000
Volterra [Member] | Order or Production Backlog [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 months 24 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		900,000
Volterra [Member] | Patents [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years 9 months 18 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Business Combination, Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		2,500,000
Other Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			6,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill			$ 500,000