DEBT (Tables)

6 Months Ended

Sep. 30, 2016

DEBT

Information related to availability on Credit Agreement

	September 30, 2016		March 31, 2016
Available borrowings	$	98,271	$	98,335
Outstanding letters of credit		1,729		1,664

1.75% Convertible Notes due 2016

DEBT

Schedule of additional information related to convertible notes

	September 30, 2016		March 31, 2016
Additional paid-in capital	$	51,180	$	51,180
Principal amount of 1.75% Convertible Notes	$	250,000	$	250,000
Unamortized discount of the liability component		2,037		8,014
Carrying amount of debt issuance costs		171		657
Net carrying amount of 1.75% Convertible Notes	$	247,792	$	241,329

Schedule of components of interest expense related to convertible notes

	Three Months Ended September 30,				Six Months Ended September 30,
	2016		2015		2016		2015
Cash interest expense (coupon interest expense)	$	1,093	$	1,093	$	2,187	$	2,187
Non-cash amortization of discount on 1.75% Convertible Notes		3,014		2,818		5,977		5,591
Amortization of debt issuance costs		241		252		486		508
Total interest expense related to 1.75% Convertible Notes	$	4,348	$	4,163	$	8,650	$	8,286

1.00% Convertible Notes due 2018

DEBT

Schedule of additional information related to convertible notes

	September 30, 2016		March 31, 2016
Additional paid-in capital	$	35,784	$	35,784
Principal amount of 1.00% Convertible Notes	$	287,500	$	287,500
Unamortized discount of the liability component		22,968		29,972
Carrying amount of debt issuance costs		688		922
Net carrying amount of 1.00% Convertible Notes	$	263,844	$	256,606

Schedule of components of interest expense related to convertible notes

	Three Months Ended September 30,				Six Months Ended September 30,
	2016		2015		2016		2015
Cash interest expense (coupon interest expense)	$	698	$	718	$	1,417	$	1,437
Non-cash amortization of discount on 1.00% Convertible Notes		3,869		2,999		7,004		5,953
Amortization of debt issuance costs		127		112		234		224
Total interest expense related to 1.00% Convertible Notes	$	4,694	$	3,829	$	8,655	$	7,614