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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges and adjustments | $ 489 | $ 2,834 | $ 491 | $ 2,831 |  |  |
Gains Losses And Other Items Net |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  | 500 |  | $ 2,800 | $ 6,500 |
Restructuring Activity2015 | Gains Losses And Other Items Net |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges and adjustments |  |  |  |  |  |  | $ 9,200
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 |  |  | 800 |  |  |  |
Restructuring reserve | 400 |  | 400 |  |  |  |
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 |  |  |  |  | $ 2,600 | 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 |  |  |  |  |  | $ 2,100 |
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 charges and adjustments |  |  |  |  |  |  | $ 2,600
Restructuring reserve | $ 300 |  | $ 300 |  |  |  |

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