Annual report pursuant to Section 13 and 15(d)

RESTRUCTURING CHARGES - Narrative (Details)

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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