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Note 2 - Acquisitions - Preliminary Price Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2017
Apr. 04, 2016
Mar. 25, 2016
Apr. 01, 2017
Apr. 02, 2016
Dec. 31, 2016
Cash, net of cash acquired       $ 14,172 $ 264,098  
Fair value of commitment to purchase non-controlling interest       9,000  
Goodwill       $ 428,343   $ 403,544
Monolith [Member]            
Original investment $ 3,500          
Cash, net of cash acquired 14,172          
Fair value of commitment to purchase non-controlling interest 9,000          
Total purchase consideration 26,672          
Current assets, net 891          
Property, plant, and equipment 789          
Goodwill 20,641          
Current liabilities (639)          
Other non-current liabilities (1,870)          
26,672          
Total purchase consideration 15,000          
Monolith [Member] | Patented and Unpatented Technologies [Member]            
Intangible assets, other than goodwill 6,720          
Monolith [Member] | Noncompete Agreements [Member]            
Intangible assets, other than goodwill 140          
TVS Diode, Thyristor and IGBT Business [Member]            
Current assets, net 4,816          
Goodwill 56,084          
Cash 104,000          
104,000          
TVS Diode, Thyristor and IGBT Business [Member] | Customer Relationships [Member]            
Intangible assets, other than goodwill 31,800          
TVS Diode, Thyristor and IGBT Business [Member] | Patented and Unpatented Technologies [Member]            
Intangible assets, other than goodwill 8,800          
TVS Diode, Thyristor and IGBT Business [Member] | Noncompete Agreements [Member]            
Intangible assets, other than goodwill 2,500          
Menber's S.p.A. [Member]            
Cash, net of cash acquired 19,162          
Current assets, net 12,919          
Property, plant, and equipment 1,693          
Goodwill 8,091          
Current liabilities (7,220)          
19,162          
Other non-current liabilities (1,444)          
Total purchase consideration   $ 19,200        
Menber's S.p.A. [Member] | Customer Relationships [Member]            
Intangible assets, other than goodwill 3,050          
Menber's S.p.A. [Member] | Patented and Unpatented Technologies [Member]            
Intangible assets, other than goodwill 224          
Menber's S.p.A. [Member] | Trademarks and Trade Names [Member]            
Intangible assets, other than goodwill 1,849          
PolySwitch [Member]            
Current assets, net 60,228          
Property, plant, and equipment 51,613          
Goodwill 165,088          
Current liabilities (35,280)          
Cash           $ 344,500
348,292          
Other non-current liabilities (5,020)          
Original consideration 350,000          
Post closing consideration adjustment received (1,708)          
Acquired cash (3,810)          
Acquired cash to be returned to seller 3,810          
Total purchase consideration 348,292   $ 348,300      
Land lease 4,290          
Other long-term assets 11,228          
PolySwitch [Member] | Customer Relationships [Member]            
Intangible assets, other than goodwill 39,720          
PolySwitch [Member] | Patented and Unpatented Technologies [Member]            
Intangible assets, other than goodwill $ 56,425