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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 3 Months Ended
Jun. 30, 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 June 30, 2012 and March 31, 2012:

(in thousands)
 
June 30, 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
 
$
159,846

 
$
—

 
$
—

 
$
159,846

 
$
147,338

 
$
—

 
$
—

 
$
147,338

Cash equivalents
 
44,792

 
1

 
—

 
44,793

 
61,996

 
2

 
(1
)
 
61,997

Total Cash and cash equivalents
 
$
204,638

 
$
1

 
$
—

 
$
204,639

 
$
209,334

 
$
2

 
$
(1
)
 
$
209,335

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
85,564

 
$
22

 
$
(15
)
 
$
85,571

 
$
61,898

 
$
22

 
$
(24
)
 
$
61,896

Commercial Paper
 
14,124

 
6

 
(1
)
 
14,129

 
20,041

 
1

 
(3
)
 
20,039

Corporate Bonds
 
46,111

 
53

 
(14
)
 
46,150

 
38,300

 
60

 
(4
)
 
38,356

Certificates of Deposit ("CDs")
 
4,882

 
2

 
—

 
4,884

 
4,883

 
3

 
—

 
4,886

Total Short-term investments
 
$
150,681

 
$
83

 
$
(30
)
 
$
150,734

 
$
125,122

 
$
86

 
$
(31
)
 
$
125,177

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
10,146

 
$
9

 
$
(2
)
 
$
10,153

 
$
29,814

 
$
24

 
$
(1
)
 
$
29,837

Corporate Bonds
 
19,118

 
42

 
(3
)
 
19,157

 
25,507

 
29

 
(26
)
 
25,510

Total Long-term investments
 
$
29,264

 
$
51

 
$
(5
)
 
$
29,310

 
$
55,321

 
$
53

 
$
(27
)
 
$
55,347

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents and investments
 
$
384,583

 
$
135

 
$
(35
)
 
$
384,683

 
$
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 June 30, 2012 and March 31, 2012:

(in thousands)
 
June 30, 2012
 
March 31, 2012
 
 
Amortized
Cost
 
Fair Value
 
Amortized
Cost
 
Fair Value
Due in 1 year or less
 
$
195,473

 
$
195,527

 
$187,118
 
$187,174
Due in 1 to 3 years
 
29,264

 
29,310

 
55,321

 
55,347

Total
 
$
224,737

 
$
224,837

 
$242,439
 
$242,521