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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
May 01, 2019
May 02, 2018
Authorized (in shares)   1,200,000        
IXYS converted awards (in shares)   499,027        
Allocated share based compensation   $ 19,900 $ 28,200 $ 17,300    
Options intrinsic value   12,500 38,300 2,200    
Options vested fair value   15,500 20,800 15,000    
Share-based liabilities paid   900 1,100 900    
Unrecognized compensation cost   $ 17,400        
Unrecognized compensation cost, period for recognition   1 year 9 months 18 days        
Income tax benefit   $ 3,300 $ 6,000 6,000    
Share repurchase program authorized (in shares)         1,000,000 1,000,000
Purchase of common stock (in shares)   579,916 391,972      
Repurchases of common stock   $ 95,036 $ 67,908      
Stock compensation expense   $ 19,046 $ 27,431 $ 16,315    
Options            
Award vesting period   4 years        
IXYS Corporation | Options            
Allocated share based compensation   $ 11,900        
Minimum | Options            
Award vesting period   3 years        
Award expiration period   7 years        
Minimum | Non-vested restricted share and share unit awards            
Award vesting period   3 years        
Maximum | Options            
Award vesting period   5 years        
Award expiration period   10 years        
Maximum | Non-vested restricted share and share unit awards            
Award vesting period   4 years        
Selling, General and Administrative Expenses | IXYS Corporation            
Stock compensation expense $ 4,500