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Fair Value Measurements - Narrative (Details) - USD ($)			3 Months Ended			6 Months Ended
	Jun. 30, 2020	Oct. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan			$ 24,559,000			$ 24,559,000		$ 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
Impairment of non-marketable investments			0		$ 0	0	$ 0
Impairment of long-lived assets held-for-use			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			24,559,000			24,559,000		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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Amount of liability recognized arising from contingent consideration in a business combination.

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