FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Hierarchy of Financial Assets and Liabilities

The following tables present the Company’s cash and financial assets and liabilities, measured at fair value, by level within the fair value hierarchy as of December 31, 2013 and March 31, 2013.

Fair Values as of December 31, 2013:

(in thousands)	Level 1		Level 2		Total
Cash and cash equivalents:
Cash	$	225,310	$	—	$	225,310
Mutual funds	1,227		—		1,227
Commercial paper	—		8,997		8,997
Short-term investments:
Government Agency Securities	—		19,232		19,232
Commercial paper	—		43,805		43,805
Corporate bonds	—		22,357		22,357
CDs	—		1,003		1,003
Long-term investments:
Government Agency Securities	—		36,938		36,938
Corporate bonds	—		69,862		69,862
Other current assets:
Derivative assets	—		967		967
Total assets measured at fair value	$	226,537	$	203,161	$	429,698
Accrued liabilities:
Derivative liabilities	$	—	$	3,841	$	3,841

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