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RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments | $ (5) |  | $ 233 | $ 1,197 | $ 1,890 |  |  |  |  |
Restructuring reserve | 4,200 |  |  | 4,200 |  |  |  |  |  |
Business exit costs |  | $ 1,000 |  |  |  |  |  |  |  |
Adjustment to existing restructured leases |  | $ (900) |  |  |  |  |  |  |  |
Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  | 1,200 |  |  |  |  |  |
Restructuring Activity 2020 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  | $ 3,400 |  |  |  |
Restructuring Activity 2019 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  | $ 7,700 |  |  |
Restructuring Activity 2018 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  | $ 2,700 |  |
Restructuring Activity 2017 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  | $ 3,000 |
Restructuring Activity 2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  |  | $ 9,300
Employee Severance |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring reserve | 100 |  |  | 100 |  |  |  |  |  |
Employee Severance | Restructuring Activity 2018 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  | 200 |  |
Employee Severance | Restructuring Activity 2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  |  | 2,600
Termination Of Associates | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  | 100 |  |  |  |  |  |
Termination Of Associates | Restructuring Activity 2020 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  | 1,100 |  |  |  |
Termination Of Associates | Restructuring Activity 2019 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  | 800 |  |  |
Termination Of Associates | Restructuring Activity 2018 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  | $ 2,500 |  |
Termination Of Associates | Restructuring Activity 2017 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  | 3,000 |
Leased office facilities | Restructuring Activity 2017 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  | 1,500 |
Adjustments to estimates related to the fiscal 2015 lease accruals | Restructuring Activity 2017 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  | $ 1,500 |
Contract Termination | Restructuring Activity 2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  |  | 4,700
Leasehold Improvement Write Offs | Restructuring Activity 2019 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  | 800 |  |  |
Leasehold Improvement Write Offs | Restructuring Activity 2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  |  |  | $ 2,000
United States and Europe | Employee Severance |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  | 1,100 |  |  |  |  |  |
United States | Employee Severance | Restructuring Activity 2020 |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  | 1,700 |  |  |  |
Asia-Pacific ("APAC") | Employee Severance | Restructuring Activity 2020 |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  | $ 600 |  |  |  |
United States Australia China And Europe | Employee Severance | Restructuring Activity 2019 |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  | $ 6,100 |  |  |
United States Australia China And Europe | Employee Severance | Restructuring Activity 2015 |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring reserve | $ 200 |  |  | $ 200 |  |  |  |  |  |

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