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Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 5 Months Ended 9 Months Ended
Apr. 18, 2018
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Purchase price allocation              
Goodwill   $ 396,689   $ 396,689 $ 396,689   $ 288,227
Revenues   230,243 $ 198,723   652,733 $ 567,849  
Pro forma financial information              
Revenues   230,243 212,572   666,575 609,482  
Net income   $ 31,528 $ 16,944   $ 72,722 $ 37,037  
Earnings per share, Basic   $ 0.73 $ 0.40   $ 1.68 $ 0.87  
Earnings per share, Diluted   $ 0.71 $ 0.39   $ 1.65 $ 0.86  
Z-Wave              
Acquisition              
Cash consideration $ 243,000            
Purchase price allocation              
Intangible assets 125,675            
Cash and cash equivalents 2,841            
Accounts receivable 5,311            
Inventory 15,581            
Other current assets 329            
Goodwill 108,461            
Other non-current assets 2,587            
Accounts payable (3,306)            
Other current liabilities (8,917)            
Other non-current liabilities (5,993)            
Total purchase price $ 242,569            
Discount rate applicable to the cash flows (as a percent) 15.00%            
Revenues       20,500      
Z-Wave | Selling, general and administrative              
Purchase price allocation              
Acquisition-related costs       $ 4,900      
Z-Wave | Developed technology              
Purchase price allocation              
Intangible assets $ 69,875            
Weighted-Average Amortization Period 7 years            
Z-Wave | Customer relationships              
Purchase price allocation              
Intangible assets $ 25,000            
Weighted-Average Amortization Period 4 years            
Z-Wave | Trademarks              
Purchase price allocation              
Intangible assets $ 9,900            
Weighted-Average Amortization Period 7 years            
Z-Wave | In-process research and development              
Purchase price allocation              
Intangible assets $ 20,900