Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]      
Federal statutory rate (as a percent) 35.00%    
Increase in balances related to tax positions taken in prior period $ 243 $ 411 $ 0
Total unrecognized tax benefit including interest and penalties 34,000    
Accrued interest and penalties 1,300    
Income Tax Examination [Line Items]      
Federal net operating loss 295,800    
Tax credit carryforwards 91,300    
Federal net operating loss carryforwards attributable to excess tax deductions from stock option exercises 34,300    
Acquired net operating losses included in carryforwards 11,100    
Acquired credits included in carryforwards $ 9,600    
Minimum      
Income Tax Examination [Line Items]      
Open years 3 years    
Maximum      
Income Tax Examination [Line Items]      
Open years 5 years