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RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments | $ (143) |  | $ 489 | $ 1,657 | $ 490 |  |  |
Restructuring reserve | 5,200 |  |  | 5,200 |  |  |  |
Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  | $ 7,700 |  | 1,700 |  | $ 2,700 | $ 3,000 |
Restructuring Activity2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  | $ 9,300
Employee Severance | Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  | 200 |  |
Employee Severance | Restructuring Activity 2018 |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  | 6,100 |  | 1,800 |  |  |  |
Restructuring reserve | 300 |  |  | 300 |  |  |  |
Employee Severance | Restructuring Activity2015 | 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 |  | 800 |  | (100) |  | $ 2,500 | 3,000 |
Leased office facilities | 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 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  | $ 1,500 |
Contract Termination | Restructuring Activity2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  | 4,700
Leasehold Improvement Write Offs | Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  | $ 800 |  |  |  |  |  |
Leasehold Improvement Write Offs | Restructuring Activity2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  |  | $ 2,000
United States Australia China And Europe | Employee Severance | Restructuring Activity2015 |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring reserve | $ 200 |  |  | $ 200 |  |  |  |

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