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Business Combinations (Allocation of the Purchase Price) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Sep. 04, 2014
Business Acquisition [Line Items]
Goodwill	$ 283,239us-gaap_Goodwill	$ 278,849us-gaap_Goodwill	$ 252,419us-gaap_Goodwill
Raid Software License [Member]
Business Acquisition [Line Items]
Intangible assets				44,900
Equipment				873
Other current assets				337
Goodwill				4,390
Total assets				50,500
Total acquisition consideration				50,500
Integrated Device Technology, Inc. [Member]
Business Acquisition [Line Items]
Current assets		2,423
Intangible assets		67,400
Goodwill		26,430
Total assets		96,253
Assumed liabilities		155
Total acquisition consideration		$ 96,098