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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 9 Months Ended
Dec. 31, 2012
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents and Investments [Table Text Block]
The following table represents the Company’s cash, cash equivalents and investments as of December 31, 2012 and March 31, 2012:

(in thousands)
 
December 31, 2012
 
March 31, 2012
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Cash and cash equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
 
$
146,965

 
$
—

 
$
—

 
$
146,965

 
$
147,338

 
$
—

 
$
—

 
$
147,338

Cash equivalents
 
49,690

 
1

 
—

 
49,691

 
61,996

 
2

 
(1
)
 
61,997

Total cash and cash equivalents
 
$
196,655

 
$
1

 
$
—

 
$
196,656

 
$
209,334

 
$
2

 
$
(1
)
 
$
209,335

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
65,530

 
$
28

 
$
—

 
$
65,558

 
$
61,898

 
$
22

 
$
(24
)
 
$
61,896

Commercial paper
 
28,384

 
6

 
—

 
28,390

 
20,041

 
1

 
(3
)
 
20,039

Corporate bonds
 
36,270

 
33

 
(9
)
 
36,294

 
38,300

 
60

 
(4
)
 
38,356

Certificates of deposit ("CDs")
 
2,002

 
1

 
—

 
2,003

 
4,883

 
3

 
—

 
4,886

Total short-term investments
 
$
132,186

 
$
68

 
$
(9
)
 
$
132,245

 
$
125,122

 
$
86

 
$
(31
)
 
$
125,177

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
63,939

 
$
40

 
$
—

 
$
63,979

 
$
29,814

 
$
24

 
$
(1
)
 
$
29,837

Corporate bonds
 
14,620

 
20

 
(6
)
 
14,634

 
25,507

 
29

 
(26
)
 
25,510

CDs
 
1,002

 
4

 
—

 
1,006

 
—

 
—

 
—

 
—

Total long-term investments
 
$
79,561

 
$
64

 
$
(6
)
 
$
79,619

 
$
55,321

 
$
53

 
$
(27
)
 
$
55,347

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents and investments
 
$
408,402

 
$
133

 
$
(15
)
 
$
408,520

 
$
389,777

 
$
141

 
$
(59
)
 
$
389,859
Amortized Cost and Fair Value of Cash Equivalents, Short-Term Investments and Long-Term Investments by Stated Maturity [Table Text Block]
The following table summarizes the amortized cost and fair value of the Company’s cash equivalents, short-term investments and long-term investments, classified by stated maturity as of December 31, 2012 and March 31, 2012:

(in thousands)
 
December 31, 2012
 
March 31, 2012
 
 
Amortized
Cost
 
Fair Value
 
Amortized
Cost
 
Fair Value
Due in 1 year or less
 
$
181,876

 
$
181,936

 
$
187,118

 
$
187,174

Due in 1 to 3 years
 
79,561

 
79,619

 
55,321

 
55,347

Total
 
$
261,437

 
$
261,555

 
$
242,439

 
$
242,521