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Business Acquisitions (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 21, 2018 | Aug. 11, 2017 | Apr. 20, 2016 | Nov. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | $ 24,180,000 | $ 15,607,000 | $ 9,367,000
Change in fair value of contingent consideration for business acquisition |  |  |  |  | 0 | (4,908,000) | (8,092,000)
Payment of contingent consideration for business acquisition |  |  |  |  | 0 | 5,000,000 | 0
Acquisition-related costs |  |  |  |  | 1,700,000 | 1,400,000 | 1,500,000
Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price | $ 134,800,000 |  |  |  |  |  |
Purchase accounting effect on inventories | $ 1,800,000 |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | $ 45,700,000 |  |
Percent of revenue from acquiree since acquisition date |  |  |  |  | 2.00% |  |
Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  | $ 85,000,000.0 |  |  |  |  |
Purchase accounting effect on inventories |  | $ 800,000 |  |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 5,200,000 |  |  |
Cash acquired in acquisition |  |  |  | 900,000 |  |  |
Jaybird LLC of Salt Lake City |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 54,200,000 |  |  |  |
Revenue Growth | Jaybird LLC of Salt Lake City |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Maximum earn-out |  |  | $ 45,000,000.0 |  |  |  |
Earn-out term |  |  | 2 years |  |  |  |
Earn-out payments (up to) |  |  |  |  | $ 20,000,000.0 | 25,000,000.0 |
Fair value of contingent consideration (earn-out) |  |  | $ 18,000,000.0 |  |  |  |
Change in fair value of contingent consideration for business acquisition |  |  |  |  |  | (4,900,000) | $ (8,100,000)
Payment of contingent consideration for business acquisition |  |  |  | $ 5,000,000.0 |  |  |
Developed technology | Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 2,100,000 |  |
Developed technology | Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 3,100,000 | 2,000,000.0 |
Customer Relationships and Trade Names | Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 2,500,000 |  |
Customer Relationships and Trade Names | Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | $ 5,300,000 | $ 3,300,000 |
Level 3 | Developed technology | Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Royalty rate for value measurement | 10.00% |  |  |  |  |  |
Level 3 | Developed technology | Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Royalty rate for value measurement |  | 10.00% |  |  |  |  |
Level 3 | Trade name | Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Royalty rate for value measurement | 3.00% |  |  |  |  |  |
Level 3 | Trade name | Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Royalty rate for value measurement |  | 2.00% |  |  |  |  |
Measurement Input, Discount Rate | Level 3 | Developed technology | Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Discount rate | 11.00% |  |  |  |  |  |
Measurement Input, Discount Rate | Level 3 | Developed technology | Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Discount rate |  | 13.00% |  |  |  |  |
Measurement Input, Discount Rate | Level 3 | Customer relationships | Blue Microphones Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Discount rate | 11.00% |  |  |  |  |  |
Measurement Input, Discount Rate | Level 3 | Customer relationships | Astro Gaming |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Discount rate |  | 13.00% |  |  |  |  |

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- Definition Upon sales of the inventory, the difference between the fair value of the inventories and the amount recognized by the acquiree immediately before the acquisition date + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Cash outflow representing an adjustment to the purchase price of a previous acquisition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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