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Fair Value Measurements (Narrative) (Details) - USD ($)
shares in Millions
3 Months Ended 12 Months Ended
Mar. 02, 2020
Oct. 31, 2019
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of marketable securities     $ 20,085,000 $ 20,085,000 $ 20,363,000  
Fair value of contingent consideration (earn-out)     23,284,000 23,284,000 0  
Investment in privately held companies     45,949,000 45,949,000 16,022,000  
Gain on investment in privately held companies     39,800,000      
Impairment of long-lived assets       0 0 $ 0
Equity securities without readily determinable fair value impairment       0 0  
Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Equity method investment     42,100,000 42,100,000 6,600,000  
Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of marketable securities     20,085,000 20,085,000 20,363,000  
Fair Value, Measurements, Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of marketable securities     0 0 0  
Fair Value, Measurements, Nonrecurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Equity securities without readily determinable fair value     3,900,000 3,900,000 9,500,000  
Streamlabs            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Maximum additional earn-out   $ 29,000,000.0        
Fair value of contingent consideration (earn-out)   $ 37,000 23,300,000 23,300,000    
Marlin            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Total consideration received $ 45,300,000          
Cash and cash equivalents 3,000,000.0          
Cash received, held in escrow $ 800,000          
Percent of voting interest acquired 11.80%          
Value of voting interests acquired $ 33,900,000          
Fair value of voting interest acquired $ 35,000,000.0          
Foreign exchange contract | Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of contingent consideration (earn-out)     0 0 0  
Foreign exchange contract | Fair Value, Measurements, Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of contingent consideration (earn-out)     $ 23,284,000 23,284,000 $ 0  
Notes Payable, Other Payables | Marlin            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Interest rate (as a percent) 6.00%          
Principal amount $ 8,400,000          
Debt instrument, term 5 years          
Long-term debt $ 7,400,000          
Series A Preferred Stock | Marlin            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Number of shares acquired (in shares) 33.9          
Series B Common Units | Marlin            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Number of shares acquired (in shares) 33.9          
Valuation Technique, Discounted Cash Flow | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Measurement input, debt (as a percent) 0.103          
Measurement input, equity (as a percent) 0.125          
Lifesize, Inc.            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Equity method investment $ 5,500,000          
Gain on investment in privately held companies       $ 39,800,000    
Measurement Input, Discount for Lack of Marketability | Marlin            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Measurement input, equity (as a percent) 0.19