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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 20, 2016
Oct. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Dec. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Trading investments for deferred compensation plan         $ 17,583 $ 15,043  
Cost method investments at cost         7,100 7,400  
Lifesize | Preferred Stock              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Fair value of cost method investment             $ 5,600
Jaybird | Revenue Growth              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Maximum earn-out $ 45,000            
Earn-out payments net revenue target period 2 years            
Jaybird | Revenue Growth | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Discount rate for value measurement 16.00%            
Fair Value, Measurements, Recurring | Level 1              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities         0 0  
Trading investments for deferred compensation plan         17,583 15,043  
Fair Value, Measurements, Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities         0 9,908  
Trading investments for deferred compensation plan         $ 0 $ 0  
Fair Value, Measurements, Recurring | Jaybird | Revenue Growth              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities $ 18,000            
Scenario, Forecast | Jaybird | Revenue Growth              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Earn-out payments (up to)     $ 20,000 $ 25,000      
Contingent Consideration | Scenario, Forecast | Earn Out Payment [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Payments for release of contingent consideration   $ 5,000