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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jan. 17, 2018
USD ($)
customer
$ / shares
Jun. 30, 2018
USD ($)
Jun. 29, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Dec. 29, 2018
$ / shares
Business Acquisition [Line Items]          
Common stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01
Non-cash inventory charges     $ 0 $ 36,927  
Cash, net of cash acquired     $ 775 310,487  
Inventory amortization period     5 months    
IXYS Corporation          
Business Acquisition [Line Items]          
Number of customers | customer 3,500        
Common stock, par value (in dollars per share) | $ / shares $ 0.01        
Share price (in dollars per share) | $ / shares $ 23.00        
Share exchange ratio 0.1265        
Share price (in dollars per share) | $ / shares $ 207.5        
Consideration excluding value of stock options converted $ 814,800        
Cash 380,600        
Littelfuse stock 434,192        
Value of options converted 41,700        
Consideration transferred 856,500        
Receivables 49,100        
Net sales   $ 100,200   186,500  
Loss before income taxes   13,900   31,700  
Allocated share based compensation       4,500  
Acquisition related costs   800   11,000  
Cash, net of cash acquired $ 302,865        
Other | Operating Income (Loss)          
Business Acquisition [Line Items]          
Acquisition related costs   26,800   65,400  
Inventory adjustment   19,000   36,900  
Employee Stock Option | IXYS Corporation          
Business Acquisition [Line Items]          
Allocated share based compensation   $ 1,600   7,500  
Employee Stock Option | IXYS Corporation | Selling, General and Administrative Expenses          
Business Acquisition [Line Items]          
Allocated share based compensation       $ 4,500