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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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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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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.

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