FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Jun. 30, 2013

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 June 30, 2013:

(in thousands)	Level 1		Level 2		Total
Cash and cash equivalents:
Cash	$	242,348	$	—	$	242,348
Commercial paper	—		13,995		13,995
Short-term investments:
U.S. Treasury Bills and Government Agency Securities	—		37,417		37,417
Commercial paper	—		39,758		39,758
Corporate bonds	—		24,435		24,435
Long-term investments:
U.S. Treasury Bills and Government Agency Securities	13,082		29,819		42,901
Corporate bonds	—		41,999		41,999
CDs	—		1,004		1,004
Other current assets:
Derivative assets	—		593		593
Total assets measured at fair value	$	255,430	$	189,020	$	444,450
Accrued liabilities:
Derivative liabilities	$	9	$	1,130	$	1,139

Fair Values as of March 31, 2013:

(in thousands)	Level 1		Level 2		Total
Cash and cash equivalents:
Cash	$	118,881	$	—	$	118,881
U.S. Treasury Bills	104,995		—		104,995
Commercial paper	—		4,900		4,900
Short-term investments:
U.S. Treasury Bills and Government Agency Securities	7,243		58,864		66,107
Commercial paper	—		15,679		15,679
Corporate bonds	—		34,795		34,795
Long-term investments:
U.S. Treasury Bills and Government Agency Securities	22,904		32,454		55,358
Corporate bonds	—		23,898		23,898
CDs	—		1,005		1,005
Other current assets:
Derivative assets	—		1,665		1,665
Total assets measured at fair value	$	254,023	$	173,260	$	427,283
Accrued liabilities:
Derivative liabilities	$	3	$	291	$	294