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DEBT (Tables)
 9 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Information related to availability on Credit Agreement
Information related to availability on our Credit Agreement was as follows:
 
December 31, 2018
 
March 31, 2018
Available borrowings
$
98,319

 
$
98,335

Outstanding letters of credit
1,664

 
1,664
Schedule of Components of Interest Expense Related to Convertible Debt
The following table provides the components of interest expense related to our 1.00% Convertible Notes:
 
Three Months Ended December 31,
 
Nine Months Ended December 31,
 
2018
 
2017
 
2018
 
2017
Cash interest expense (coupon interest expense)
$
—

 
$
(60
)
 
$
1

 
$
519

Non-cash amortization of discount on 1.00% Convertible Notes
—

 
1,509

 
91

 
15,424

Amortization of debt issuance costs
—

 
48

 
3

 
471

Total interest expense related to 1.00% Convertible Notes
$
—

 
$
1,497

 
$
95

 
$
16,414