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Long-Lived Assets	3 Months Ended
Long-Lived Assets	Apr. 02, 2017
Property, Plant and Equipment [Abstract]
Long-Lived Assets	Long-Lived Assets Depreciation and Amortization Expense We recognized depreciation expense of $11.4 million and $11.7 million in the three months ended April 2, 2017 and April 3, 2016, respectively. In connection with the segment change discussed in Note 4, we re-evaluated the useful life of the Tripwire trademark and concluded that an indefinite life is no longer appropriate. We have estimated a useful life of 10 years and will re-evaluate this estimate if and when our expected use of the Tripwire trademark changes. We began amortizing the Tripwire trademark in the first quarter of 2017, which resulted in amortization expense of $0.8 million for the quarter. We recognized amortization expense related to our intangible assets of $23.7 million and $25.5 million in the three months ended April 2, 2017 and April 3, 2016, respectively.