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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
6 Months Ended
Sep. 30, 2011
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 September 30, 2011 and March 31, 2011:

(in thousands)
 
September 30, 2011
 
March 31, 2011
 
 
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
 
$
168,875

 
$
—

 
$
—

 
$
168,875

 
$
136,804

 
$
—

 
$
—

 
$
136,804

Cash equivalents
 
16,500

 
2

 
—

 
16,502

 
147,573

 
1

 
(3
)
 
147,571

Total Cash and cash equivalents
 
$
185,375

 
$
2

 
$
—

 
$
185,377

 
$
284,377

 
$
1

 
$
(3
)
 
$
284,375

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
61,988

 
$
27

 
$
(4
)
 
$
62,011

 
$
98,845

 
$
17

 
$
(1
)
 
$
98,861

Commercial Paper
 
17,988

 
1

 
—

 
17,989

 
30,071

 
5

 
(1
)
 
30,075

Corporate Bonds
 
22,070

 
6

 
(12
)
 
22,064

 
11,212

 
4

 
—

 
11,216

Certificates of Deposit ("CDs")
 
2,517

 
1

 
—

 
2,518

 
5,420

 
9

 
—

 
5,429

Total Short-term investments
 
$
104,563

 
$
35

 
$
(16
)
 
$
104,582

 
$
145,548

 
$
35

 
$
(2
)
 
$
145,581

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
21,071

 
$
8

 
$
(24
)
 
$
21,055

 
$
17,387

 
$
4

 
$
—

 
$
17,391

Corporate Bonds
 
33,316

 
17

 
(249
)
 
33,084

 
19,086

 
8

 
(35
)
 
19,059

CDs
 
4,881

 
11

 
(1
)
 
4,891

 
2,879

 
3

 
—

 
2,882

Total Long-term investments
 
$
59,268

 
$
36

 
$
(274
)
 
$
59,030

 
$
39,352

 
$
15

 
$
(35
)
 
$
39,332

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents and investments
 
$
349,206

 
$
73

 
$
(290
)
 
$
348,989

 
$
469,277

 
$
51

 
$
(40
)
 
$
469,288

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 September 30, 2011 and March 31, 2011:
(in thousands)
 
September 30, 2011
 
March 31, 2011
 
 
Amortized
Cost
 
Fair Value
 
Amortized
Cost
 
Fair Value
Due in 1 year or less
 
$
121,063

 
$
121,084

 
$
293,121

 
$
293,152

Due in 1 to 3 years
 
59,268

 
59,030

 
39,352

 
39,332

Total
 
$
180,331

 
$
180,114

 
$
332,473

 
$
332,484