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RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2016 position | Nov. 30, 2015 position | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs |  |  |  |  | $ 1,977 | $ 2,922 | $ 2,429
Severance and benefits |  |  |  |  | 1,443 | 2,293 | 406
Facilities |  |  |  |  | 620 | 1,713 | 1,260
Severance and benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs |  |  |  |  | $ 1,494 | $ 2,266 | $ 749
Fiscal 2017 April Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of positions eliminated | position | 29 |  |  |  |  |  |
Fiscal 2017 April Restructuring Plan | Severance and benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs |  |  |  | $ 1,500 |  |  |
Fiscal 2016 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of positions eliminated | position |  | 65 |  |  |  |  |
Fiscal 2016 Restructuring Plan | Severance and benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs |  |  | $ 2,000 |  |  |  |

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