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Business Acquisitions (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 15, 2016
Apr. 20, 2016
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]              
Amortization of intangible assets         $ 9,367,000 $ 1,885,000 $ 8,361,000
Goodwill         249,741,000 $ 218,224,000 $ 218,213,000
Acquisition-related costs         1,500,000    
Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Purchase price   $ 54,242,000          
Purchase accounting effect on inventories         700,000    
Estimated useful life   6 years 1 month 6 days          
Intangible assets   $ 50,280,000          
Goodwill   26,667,000          
Saitek Acquisition              
Business Acquisition [Line Items]              
Purchase price $ 13,000,000            
Intangible assets 6,700,000            
Goodwill 4,900,000            
Net tangible assets acquired $ 1,400,000            
Revenue Growth | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Maximum earn-out   $ 45,000,000          
Earn-out term   2 years          
Scenario, Forecast | Revenue Growth | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Earn-out payments (up to)     $ 20,000,000 $ 25,000,000      
Developed technology | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Amortization of intangible assets         $ 4,400,000    
Estimated useful life   4 years     5 years    
Customer relationships | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Estimated useful life   8 years          
Trade name | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Estimated useful life   6 years          
Customer Relationships and Trade Names | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Amortization of intangible assets         $ 3,800,000    
Level 3 | Revenue Growth | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Discount rate for value measurement   16.00%          
Level 3 | Developed technology | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Royalty rate for value measurement   10.00%          
Discount rate for value measurement   16.00%          
Level 3 | Customer relationships | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Discount rate for value measurement   16.00%          
Level 3 | Trade name | Jaybird LLC of Salt Lake City              
Business Acquisition [Line Items]              
Royalty rate for value measurement   2.50%