FAIR VALUE MEASUREMENTS

12 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The following table represents the Company's fair value hierarchy for its financial assets and liabilities:

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

Fair Values as of March 31, 2012:

(in thousands)	Level 1		Level 2		Total
Cash and cash equivalents:
Cash	$	147,338	$	—	$	147,338
U.S. Treasury Bills	50,000		—		50,000
Commercial Paper	—		11,997		11,997
Short-term investments:
U.S. Treasury Bills and Government Agency Securities	12,898		48,998		61,896
Commercial Paper	—		20,039		20,039
Corporate Bonds	—		38,356		38,356
CDs	—		4,886		4,886
Long-term investments:
U.S. Treasury Bills and Government Agency Securities	6,647		23,190		29,837
Corporate Bonds	—		25,510		25,510
Other current assets:
Derivative assets	—		2,658		2,658
Total assets measured at fair value	$	216,883	$	175,634	$	392,517
Accrued liabilities:
Derivative liabilities	$	7	$	714	$	721

There were no transfers between fair value measurement levels during the years ended March 31, 2013 and 2012.

Refer to Note 15, Foreign Currency Derivatives, which discloses the nature of the Company's derivative assets and liabilities as of March 31, 2013 and 2012.