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Fair Value Measurements - Narrative (Details)						3 Months Ended				6 Months Ended
	May 19, 2021 USD ($) milestone	Feb. 17, 2021 USD ($)	Jan. 04, 2021 USD ($) milestone	Jun. 30, 2020 USD ($)	Oct. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan						$ 28,375,000				$ 28,375,000		$ 24,809,000
Change in fair value of contingent consideration										(2,399,000)	$ 5,716,000
Contingent consideration transferred to equity classification							$ 28,500,000
Amounts held in escrow							500,000
Equity method investments						40,100,000				40,100,000		40,700,000
Impairment of non-marketable investments						0		$ 0		0	0
Impairment of long-lived assets held-for-use						0		0		0	0
Impairment of non-financial assets						0		$ 0		0	$ 0
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan						28,375,000				28,375,000		24,809,000
Small Technology Acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future potential earn-out payments	$ 10,000,000		$ 3,000,000
Number of technical development milestones | milestone	3		2
Mevo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future potential earn-out payments		$ 17,000,000
Contingent consideration		$ 3,400,000				$ 1,000,000				$ 1,000,000		$ 3,400,000
Streamlabs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future potential earn-out payments				$ 29,000,000	$ 29,000,000
Change in fair value of contingent consideration									$ 5,700,000
Contingent consideration transferred to equity classification							28,500,000
Amounts held in escrow							$ 500,000

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