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Fair Value Measurements (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2016 | Nov. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Payment of contingent consideration for business acquisition |  |  |  | $ 5,000,000 | $ 0 | $ 0 |
Fair value of marketable securities |  |  |  | 17,748,000 | 15,043,000 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Fair value of contingent consideration (earn-out) |  |  |  | 0 | 0 |  |
Fair value of marketable securities |  |  |  | 17,748,000 | 15,043,000 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Fair value of contingent consideration (earn-out) |  |  |  | 0 | 9,908,000 |  |
Fair value of marketable securities |  |  |  | 0 | 0 |  |
Lifesize | Fair Value, Measurements, Nonrecurring | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Cost method investments |  |  |  |  |  |  | $ 5,600,000
Other Assets |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Cost method investments |  |  |  | 7,300,000 | $ 7,400,000 |  |
Jaybird LLC of Salt Lake City |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Fair value of contingent consideration (earn-out) | $ 18,000,000 |  |  |  |  |  |
Jaybird LLC of Salt Lake City | Revenue Growth |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Maximum earn-out | $ 45,000,000 |  |  |  |  |  |
Earn-out term | 2 years |  |  |  |  |  |
Earn-out payments (up to) |  |  |  | $ 25,000,000 |  |  |
Payment of contingent consideration for business acquisition |  | $ 5,000,000 |  |  |  |  |
Jaybird LLC of Salt Lake City | Revenue Growth | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Discount rate for value measurement | 16.00% |  |  |  |  |  |
Jaybird LLC of Salt Lake City | Revenue Growth | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Fair value of contingent consideration (earn-out) | $ 18,000,000 |  |  |  |  |  |
Scenario, Forecast | Jaybird LLC of Salt Lake City | Revenue Growth |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Earn-out payments (up to) |  |  | $ 20,000,000 |  |  |  |
Contingent Consideration | Earn Out Payment |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |
Payment of contingent consideration for business acquisition |  | $ 5,000,000 |  |  |  |  |

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