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DEBT (Tables)
 12 Months Ended
Mar. 31, 2018
Debt Instrument [Line Items]  
Information related to availability on Credit Agreement
Information related to availability on our Credit Agreement is as follows:
 
 
March 31,
 
 
2018
 
2017
Available borrowings
 
$
98,335

 
$
98,320

Outstanding letters of credit
 
$
1,664

 
$
1,664
1.00% Convertible Notes due 2018  
Debt Instrument [Line Items]  
Schedule of additional information related to convertible notes
The following table provides additional information related to our 1.00% Convertible Notes:
 
 
March 31,
 
 
2018
 
2017
Additional paid-in capital
 
$
35,784

 
$
35,784

Principal amount of 1.00% Convertible Notes
 
$
8,160

 
$
268,149

Unamortized discount of the liability component
 
89

 
15,751

Carrying amount of debt issuance costs
 
3

 
469

Net carrying amount of 1.00% Convertible Notes
 
$
8,068

 
$
251,929
Schedule of components of interest expense related to convertible notes
The following table provides the components of interest expense related to our 1.00% Convertible Notes:
 
 
Fiscal Year Ended March 31,
 
 
2018
 
2017
 
2016
Cash interest expense (coupon interest expense)
 
$
539

 
$
2,784

 
$
2,875

Non-cash amortization of discount on 1.00% Convertible Notes
 
15,662

 
14,221

 
12,085

Amortization of debt issuance costs
 
466

 
453

 
443

Total interest expense related to 1.00% Convertible Notes
 
$
16,667

 
$
17,458

 
$
15,403