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Fair Value Measurements (Narrative) (Details)						3 Months Ended		12 Months Ended
	Feb. 17, 2021 USD ($)	Jan. 04, 2021 USD ($) milestone	Jun. 30, 2020 USD ($)	Mar. 02, 2020 USD ($)	Oct. 31, 2019 USD ($)	Dec. 31, 2020 shares	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of marketable securities								$ 24,809,000	$ 20,085,000
Fair value of contingent consideration (earn-out)								6,967,000	23,284,000
Change in fair value of contingent consideration								5,716,000	23,247,000
Treasury shares reissued (in shares) | shares						390,397
Impairment of long-lived assets								0	0	$ 0
Equity securities without readily determinable fair value impairment								2,011,000	0	$ 0
Initial cost basis of securities								2,000,000.0
Lifesize, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment				$ 5,500,000
Proceeds from sale of equity method investments				$ 45,300,000
Marlin
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment								26,700,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment								40,700,000	42,100,000
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of marketable securities								24,809,000	20,085,000
Mevo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Future potential earn-out payments	$ 17,000,000.0
Fair value of contingent consideration (earn-out)	$ 3,400,000
Small Technology Acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Future potential earn-out payments		$ 3,000,000.0
Number of technical development milestones | milestone		2
Streamlabs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Future potential earn-out payments			$ 29,000,000.0		$ 29,000,000.0
Fair value of contingent consideration (earn-out)					$ 40,000.00			$ 37,000	$ 23,300,000
Change in fair value of contingent consideration							$ 5,700,000
Marlin
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percent of voting interest acquired				10.80%
Marlin | Notes Payable, Other Payables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate (as a percent)				6.00%

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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