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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 20, 2016 | Oct. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Trading investments for deferred compensation plan |  |  |  |  | $ 17,583 | $ 15,043 |
Cost method investments at cost |  |  |  |  | 7,100 | 7,400 |
Lifesize | Preferred Stock |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of cost method investment |  |  |  |  |  |  | $ 5,600
Jaybird | Revenue Growth |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Maximum earn-out | $ 45,000 |  |  |  |  |  |
Earn-out payments net revenue target period | 2 years |  |  |  |  |  |
Jaybird | Revenue Growth | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Discount rate for value measurement | 16.00% |  |  |  |  |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities |  |  |  |  | 0 | 0 |
Trading investments for deferred compensation plan |  |  |  |  | 17,583 | 15,043 |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities |  |  |  |  | 0 | 9,908 |
Trading investments for deferred compensation plan |  |  |  |  | $ 0 | $ 0 |
Fair Value, Measurements, Recurring | Jaybird | Revenue Growth |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities | $ 18,000 |  |  |  |  |  |
Scenario, Forecast | Jaybird | Revenue Growth |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Earn-out payments (up to) |  |  | $ 20,000 | $ 25,000 |  |  |
Contingent Consideration | Scenario, Forecast | Earn Out Payment [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Payments for release of contingent consideration |  | $ 5,000 |  |  |  |  |

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