Quarterly report pursuant to Section 13 or 15(d)

Business Combinations Business Combination - Exar (Details)

v3.8.0.1
Business Combinations Business Combination - Exar (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
May 12, 2017
Mar. 31, 2018
Dec. 31, 2017
Nov. 09, 2016
Business Acquisition [Line Items]        
Balance as of December 31, 2017   $ 237,810 $ 237,992  
Exar Corporation [Member]        
Business Acquisition [Line Items]        
Goodwill, Purchase Accounting Adjustments   (182)    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years      
Finite-lived Intangible Assets Acquired $ 232,900      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 235,810      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 11,363      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory 48,536      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 2,288      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 3,442      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 249,500      
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 7,675      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 5,434      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable (12,385)      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Accrued Expenses and Other Current Liabilities (10,464)      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation (5,253)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other (3,030)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 532,916      
Balance as of December 31, 2017 159,811      
Business Combination, Purchase price 692,727      
Business Combination, Finite and Indefinite Lived Intangible Assets Acquired $ 249,500      
Business Acquisition, Effective Date of Acquisition May 12, 2017      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Fair Value Mark Up On Inventory $ 24,286      
Business Combination, Indemnification Assets, Amount as of Acquisition Date   5,000   $ 5,000
Business Acquisition, Name of Acquired Entity Exar Corporation      
Business Combination, Consideration Transferred $ 692,727      
Proceeds from Issuance of Debt $ 416,800      
Long-term Debt, Gross   $ 425,000    
Business acquisition, Shares Tendered 51,953,635      
Exar Corporation [Member] | Common Stock [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Share Price $ 13.00      
Cash [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred $ 688,114      
Cash in lieu of equity [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred 12,717      
Stock Based Awards [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 4,613      
Customer Relationships [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years      
Finite-lived Intangible Assets Acquired $ 96,300      
Order or Production Backlog [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 months      
Finite-lived Intangible Assets Acquired $ 3,600      
Developed technology | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years      
Finite-lived Intangible Assets Acquired $ 120,900      
Trademarks and Trade Names [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years      
Finite-lived Intangible Assets Acquired $ 12,100      
In Process Research and Development [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Indefinite-lived Intangible Assets Acquired 16,600      
Cash [Member] | Exar Corporation [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Tender Amount $ 675,400