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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 17, 2018
USD ($)
customer
$ / shares
Mar. 30, 2019
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
Dec. 29, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]        
Common stock, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01
Non-cash inventory charges   $ 0 $ 17,896  
Cash, net of cash acquired   775 306,487  
Non-cash, fair value of commitment to purchase non-controlling interest   $ 0 9,000  
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      
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      
Acquisition related costs       $ 10,200
Cash, net of cash acquired $ 302,865      
Other | Operating Income (Loss)        
Business Acquisition [Line Items]        
Allocated share based compensation     4,500  
Acquisition related costs     38,600  
Inventory adjustment     17,900  
Employee Stock Option | IXYS Corporation        
Business Acquisition [Line Items]        
Allocated share based compensation     5,900  
Employee Stock Option | IXYS Corporation | Selling, General and Administrative Expenses        
Business Acquisition [Line Items]        
Allocated share based compensation     $ 4,500