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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 12 Months Ended
Mar. 31, 2012
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents and Investments [Table Text Block]
The following table presents the Company's cash, cash equivalents and investments as of March 31, 2012 and 2011:

(in thousands)
 
March 31, 2012
 
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
 
$
147,338

 
$
—

 
$
—

 
$
147,338

 
$
136,804

 
$
—

 
$
—

 
$
136,804

Cash equivalents
 
61,996

 
2

 
(1
)
 
61,997

 
140,569

 
1

 
(1
)
 
140,569

Total Cash and cash equivalents
 
$
209,334

 
$
2

 
$
(1
)
 
$
209,335

 
$
277,373

 
$
1

 
$
(1
)
 
$
277,373

Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
61,898

 
$
22

 
$
(24
)
 
$
61,896

 
$
105,849

 
$
17

 
$
(3
)
 
$
105,863

Commercial Paper
 
20,041

 
1

 
(3
)
 
20,039

 
30,071

 
5

 
(1
)
 
30,075

Corporate Bonds
 
38,300

 
60

 
(4
)
 
38,356

 
11,212

 
4

 
—

 
11,216

Certificates of Deposit ("CDs")
 
4,883

 
3

 
—

 
4,886

 
5,420

 
9

 
—

 
5,429

Total Short-term investments
 
$
125,122

 
$
86

 
$
(31
)
 
$
125,177

 
$
152,552

 
$
35

 
$
(4
)
 
$
152,583

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
29,814

 
$
24

 
$
(1
)
 
$
29,837

 
$
17,387

 
$
4

 
$
—

 
$
17,391

Corporate Bonds
 
25,507

 
29

 
(26
)
 
25,510

 
19,086

 
8

 
(35
)
 
19,059

CDs
 
—

 
—

 
—

 
—

 
2,879

 
3

 
—

 
2,882

Total Long-term investments
 
$
55,321

 
$
53

 
$
(27
)
 
$
55,347

 
$
39,352

 
$
15

 
$
(35
)
 
$
39,332

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents and investments
 
$
389,777

 
$
141

 
$
(59
)
 
$
389,859

 
$
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 March 31, 2012 and 2011:

(in thousands)
 
March 31, 2012
 
March 31, 2011
 
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in 1 year or less
 
$
187,118

 
$
187,174

 
$
293,121

 
$
293,152

Due in 1 to 3 years
 
55,321

 
55,347

 
39,352

 
39,332

Total
 
$
242,439

 
$
242,521

 
$
332,473

 
$
332,484