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Fair Value Measurements - Narrative (Details) - USD ($)			3 Months Ended
	Jun. 30, 2020	Oct. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	$ 22,911,000		$ 22,911,000		$ 20,085,000
Contingent consideration	29,000,000		29,000,000		23,284,000
Change in fair value of contingent consideration			5,716,000
Equity method investments	42,300,000		42,300,000		42,100,000
Cost method investments	3,900,000		3,900,000		3,900,000
Impairment of non-marketable investments			0	$ 0
Impairment of long-lived assets held-for-use			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	22,911,000		22,911,000		20,085,000
Contingent consideration	0		0		0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	0		0		0
Contingent consideration	0		0		23,284,000
Streamlabs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Future potential earn-out payments	29,000,000.0	$ 29,000,000.0
Contingent consideration	$ 29,000,000.0	$ 40,000.00	29,000,000.0		$ 23,300,000
Change in fair value of contingent consideration			$ 5,700,000

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