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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% |  |  |  |  |

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