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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 12 Months Ended
Mar. 31, 2013
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents and Investments
The following table presents the Company's cash, cash equivalents and investments as of March 31, 2013 and 2012:

(in thousands)
 
March 31, 2013
 
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
 
$
118,881

 
$
—

 
$
—

 
$
118,881

 
$
147,338

 
$
—

 
$
—

 
$
147,338

Cash equivalents
 
109,895

 
—

 
—

 
109,895

 
61,996

 
2

 
(1
)
 
61,997

Total Cash and cash equivalents
 
$
228,776

 
$
—

 
$
—

 
$
228,776

 
$
209,334

 
$
2

 
$
(1
)
 
$
209,335

Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
66,092

 
$
18

 
$
(3
)
 
$
66,107

 
$
61,898

 
$
22

 
$
(24
)
 
$
61,896

Commercial Paper
 
15,670

 
9

 
—

 
15,679

 
20,041

 
1

 
(3
)
 
20,039

Corporate Bonds
 
34,766

 
31

 
(2
)
 
34,795

 
38,300

 
60

 
(4
)
 
38,356

Certificates of Deposit ("CDs")
 
—

 
—

 
—

 
—

 
4,883

 
3

 
—

 
4,886

Total Short-term investments
 
$
116,528

 
$
58

 
$
(5
)
 
$
116,581

 
$
125,122

 
$
86

 
$
(31
)
 
$
125,177

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury Bills and Government Agency Securities
 
$
55,317

 
$
42

 
$
(1
)
 
$
55,358

 
$
29,814

 
$
24

 
$
(1
)
 
$
29,837

Corporate Bonds
 
23,878

 
23

 
(3
)
 
23,898

 
25,507

 
29

 
(26
)
 
25,510

CDs
 
1,002

 
3

 
—

 
1,005

 
—

 
—

 
—

 
—

Total Long-term investments
 
$
80,197

 
$
68

 
$
(4
)
 
$
80,261

 
$
55,321

 
$
53

 
$
(27
)
 
$
55,347

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents and investments
 
$
425,501

 
$
126

 
$
(9
)
 
$
425,618

 
$
389,777

 
$
141

 
$
(59
)
 
$
389,859
Amortized Cost and Fair Value of Cash Equivalents, Short-Term Investments and Long-Term Investments by Stated Maturity
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, 2013 and 2012:

(in thousands)
 
March 31, 2013
 
March 31, 2012
 
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in 1 year or less
 
$
226,423

 
$
226,476

 
$
187,118

 
$
187,174

Due in 1 to 3 years
 
80,197

 
80,261

 
55,321

 
55,347

Total
 
$
306,620

 
$
306,737

 
$
242,439

 
$
242,521