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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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