FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Dec. 31, 2011

Fair Value Disclosures [Abstract]

Fair Value Hierarchy of Financial Assets and Liabilities [Table Text Block]

The following tables represent the Company’s fair value hierarchy for its financial assets and liabilities:

Fair Values as of December 31, 2011:

(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash	$	161,069	$	—	$	—	$	161,069
Commercial Paper	—		12,494		—		12,494
Money Market Accounts	4,500		—		—		4,500
Short-term investments:
U.S. Treasury Bills and Government Agency Securities	32,026		44,516		—		76,542
Commercial Paper	—		15,680		—		15,680
Corporate Bonds	—		24,353		—		24,353
CDs	—		2,884		—		2,884
Long-term investments:
Government Agency Securities	—		39,192		—		39,192
Corporate Bonds	—		20,767		—		20,767
CDs	—		2,002		—		2,002
Other current assets:
Derivative assets	—		4,876		—		4,876
Total assets measured at fair value	$	197,595	$	166,764	$	—	$	364,359
Accrued liabilities:
Derivative liabilities	$	11	$	2,428	$	—	$	2,439

Fair Values as of March 31, 2011:

(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash	$	136,804	$	—	$	—	$	136,804
U.S. Treasury Bills and Government Agency Securities	74,991		—		—		74,991
Commercial Paper	—		22,495		—		22,495
Corporate Bonds	—		3,082		—		3,082
CDs	—		2,001				2,001
Money Market Accounts	38,000		—		—		38,000
Short-term investments:
U.S. Treasury Bills and Government Agency Securities	71,756		34,107		—		105,863
Commercial Paper	—		30,075		—		30,075
Corporate Bonds	—		11,216		—		11,216
CDs	—		5,429		—		5,429
Long-term investments:
U.S. Treasury Bills and Government Agency Securities	7,955		9,436		—		17,391
Corporate Bonds	—		19,059		—		19,059
CDs	—		2,882		—		2,882
Other current assets:
Derivative assets	—		360		—		360
Total assets measured at fair value	$	329,506	$	140,142	$	—	$	469,648
Accrued liabilities:
Derivative liabilities	$	27	$	4,174	$	—	$	4,201