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Fair Value Measurements (Narrative) (Details) - USD ($)
12 Months Ended
Apr. 20, 2016
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Dec. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Trading investments for deferred compensation plan       $ 15,043,000 $ 14,836,000  
Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Trading investments for deferred compensation plan       15,043,000 14,836,000  
Fair value of contingent consideration (earn-out)       0 0  
Fair Value, Measurements, Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Trading investments for deferred compensation plan       0 0  
Fair value of contingent consideration (earn-out)       9,908,000 0  
Lifesize | Fair Value, Measurements, Nonrecurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Cost method investments           $ 5,600,000
Other Assets            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Cost method investments       7,400,000 7,400,000  
Jaybird LLC of Salt Lake City            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of contingent consideration (earn-out) $ 18,000,000          
Jaybird LLC of Salt Lake City | Revenue Growth            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Maximum earn-out $ 45,000,000          
Earn-out term 2 years          
Jaybird LLC of Salt Lake City | Revenue Growth | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Discount rate for value measurement 16.00%          
Jaybird LLC of Salt Lake City | Revenue Growth | Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of contingent consideration (earn-out) $ 18,000,000          
Scenario, Forecast | Jaybird LLC of Salt Lake City | Revenue Growth            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Earn-out payments (up to)   $ 20,000,000 $ 25,000,000      
Contingent Consideration            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis            
Fair value of contingent consideration       $ 9,908,000 $ 0