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Business Acquisitions (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 11, 2017 | Sep. 15, 2016 | Apr. 20, 2016 | Nov. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  | $ 15,607,000 | $ 9,367,000 | $ 1,885,000
Payment of contingent consideration for business acquisition |  |  |  |  |  |  | 5,000,000 | 0 | 0
Goodwill |  |  |  |  |  |  | 275,451,000 | 249,741,000 | $ 218,224,000
Acquisition-related costs |  |  |  |  |  |  | $ 1,400,000 | 1,500,000 |
Astro Gaming |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price | $ 85,000,000 |  |  |  |  |  |  |  |
Purchase accounting effect on inventories | 800,000 |  |  |  |  |  |  |  |
Acquiree contribution to increase in sales revenue (percent) |  |  |  |  |  |  | 2.00% |  |
Intangible assets | 52,520,000 |  |  |  |  |  |  |  |
Goodwill | $ 21,766,000 |  |  |  |  |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 5,200,000 |  |  |  |  |
Cash acquired in acquisition |  |  |  | 900,000 |  |  |  |  |
Unpaid purchase price for business acquisition |  |  |  | 1,000,000 |  |  |  |  |
Jaybird LLC of Salt Lake City |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 54,242,000 |  |  |  |  |  |
Purchase accounting effect on inventories |  |  | 700,000 |  |  |  |  |  |
Consideration transferred |  |  | $ 72,242,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Earn-out payments (up to) |  |  |  |  |  |  | $ 25,000,000 |  |
Payment of contingent consideration for business acquisition |  |  |  | $ 5,000,000 |  |  |  |  |
Scenario, Forecast | Revenue Growth | Jaybird LLC of Salt Lake City |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Earn-out payments (up to) |  |  |  |  |  | $ 20,000,000 |  |  |
Developed technology | Astro Gaming |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  | 2,000,000 |  |
Developed technology | Jaybird LLC of Salt Lake City |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  | 5,100,000 | 4,400,000 |
Estimated useful life |  |  | 4 years |  | 5 years |  |  |  |
Customer relationships | Jaybird LLC of Salt Lake City |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  | 4,000,000 | $ 3,800,000 |
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 | Astro Gaming |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  | $ 3,300,000 |  |
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 | Astro Gaming |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Royalty rate for value measurement | 10.00% |  |  |  |  |  |  |  |
Discount rate for value measurement | 13.00% |  |  |  |  |  |  |  |
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 | Astro Gaming |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Discount rate for value measurement | 13.00% |  |  |  |  |  |  |  |
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 | Astro Gaming |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Royalty rate for value measurement | 2.00% |  |  |  |  |  |  |  |
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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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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