LONG-TERM DEBT (Tables)

9 Months Ended

Dec. 31, 2011

Long-term debt

Information related to availability on Credit Agreement

	December 31, 2011		March 31, 2011
Available borrowings	$	98,218	$	115,503
Outstanding letters of credit		1,664		1,664

4.375% convertible senior notes due 2014 ("Convertible Notes")

Long-term debt

Information about carrying amount and components of interest expense of convertible notes

	December 31, 2011		March 31, 2011
Additional paid-in capital	$	42,018	$	42,018
Principal amount of 4.375% Convertible Notes	$	138,000	$	138,000
Unamortized discount of the liability component		24,570		30,761
Net carrying amount of 4.375% Convertible Notes	$	113,430	$	107,239
Carrying amount of debt issuance costs	$	1,649	$	2,161

	Three Months Ended December 31,				Nine Months Ended December 31,
	2011		2010		2011		2010
Cash interest expense (coupon interest expense)	$	1,509	$	1,509	$	4,527	$	4,494
Non-cash amortization of discount on 4.375% Convertible Notes		2,131		1,872		6,191		5,440
Amortization of debt issuance costs		171		171		512		512
Total interest expense related to 4.375% Convertible Notes	$	3,811	$	3,552	$	11,230	$	10,446

1.75% Convertible Notes due 2016

Long-term debt

Information about carrying amount and components of interest expense of convertible notes

	December 31, 2011
Additional paid-in capital	$	51,180
Principal amount of 1.75% Convertible Notes	$	250,000
Unamortized discount of the liability component		51,524
Net carrying amount of 1.75% Convertible Notes	$	198,476
Carrying amount of debt issuance costs	$	5,277

	Three Months Ended December 31, 2011		Nine Months Ended December 31, 2011
Cash interest expense (coupon interest expense)	$	547	$	547
Non-cash amortization of discount on 1.75% Convertible Notes		1,103		1,103
Amortization of debt issuance costs		151		151
Total interest expense related to 1.75% Convertible Notes	$	1,801	$	1,801

Summarizes annual commitments related to convertible notes

Fiscal year ending March 31,	Interest		1.75% Convertible Notes		Total
2012 (remaining three months)	$	—	$	—	$	—
2013		4,557		—		4,557
2014		4,375		—		4,375
2015		4,375		—		4,375
2016		4,375		—		4,375
Thereafter		4,375		250,000		254,375
Total	$	22,057	$	250,000	$	272,057