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Financial Instruments (Tables)
 3 Months Ended
Jun. 30, 2012
Investments, All Other Investments [Abstract]  
Available-for-sale securities
The following is a summary of cash equivalents and available-for-sale securities as of the end of the periods presented:

June 30, 2012

 
March 31, 2012
(In thousands)
Amortized Cost

Gross Unrealized Gains

Gross Unrealized Losses

Estimated Fair Value

 
Amortized Cost

Gross Unrealized Gains

Gross Unrealized Losses

Estimated Fair Value
Money market funds
$
174,888


$
—


$
—


$
174,888


 
$
232,017


$
—


$
—


$
232,017

Bank certificates of deposit
189,914


—


—


189,914


 
159,972


—


—


159,972

Commercial paper
489,826


—


—


489,826


 
594,867


1


(1
)

594,867

Corporate bonds
207,372


3,713


(213
)

210,872


 
186,455


3,401


(184
)

189,672

Auction rate securities
32,250


—


(3,435
)

28,815


 
32,600


—


(3,671
)

28,929

Municipal bonds
19,598


677


(61
)

20,214


 
25,454


734


(28
)

26,160

U.S. government and








 







   agency securities
668,759


382


(92
)

669,049


 
668,702


360


(149
)

668,913

Foreign government and








 







    agency securities
228,947


1


—


228,948


 
249,951


—


—


249,951

Mortgage-backed securities
1,008,823


17,580


(2,193
)

1,024,210


 
878,842


15,094


(1,160
)

892,776

Debt mutual fund
40,500


—


(260
)

40,240


 
20,000


—


(219
)

19,781


$
3,060,877


$
22,353


$
(6,254
)

$
3,076,976


 
$
3,048,860


$
19,590


$
(5,412
)

$
3,063,038
Fair values and gross unrealized losses of the investments
The following tables show the fair values and gross unrealized losses of the Company’s investments, aggregated by investment category, for individual securities that have been in a continuous unrealized loss position for the length of time specified, as of June 30, 2012 and March 31, 2012:


June 30, 2012

Less Than 12 Months

12 Months or Greater

Total
(In thousands)
Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses
Corporate bonds
$
30,040


$
(122
)

$
1,782


$
(92
)

$
31,822


$
(214
)
Auction rate securities
—


—


28,814


(3,436
)

28,814


(3,436
)
Municipal bonds
2,271


(56
)

717


(5
)

2,988


(61
)
U.S. government and













    agency securities
472,979


(92
)

—


—


472,979


(92
)
Mortgage-backed securities
224,250


(2,016
)

17,480


(175
)

241,730


(2,191
)
Debt mutual fund
40,240


(260
)

—


—


40,240


(260
)

$
769,780


$
(2,546
)

$
48,793


$
(3,708
)

$
818,573


$
(6,254
)


March 31, 2012

Less Than 12 Months

12 Months or Greater

Total
(In thousands)
Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses
Commercial paper
$
79,994


$
(1
)

$
—


$
—


$
79,994


$
(1
)
Corporate bonds
21,111


(184
)

—


—


21,111


$
(184
)
Auction rate securities
—


—


28,929


(3,671
)

28,929


$
(3,671
)
Municipal bonds
2,173


(24
)

366


(4
)

2,539


$
(28
)
U.S. government and













    agency securities
460,735


(149
)

—


—


460,735


$
(149
)
Mortgage-backed securities
147,726


(1,040
)

15,923


(120
)

163,649


$
(1,160
)
Debt mutual fund
19,781


(219
)

—


—


19,781


$
(219
)

$
731,520


$
(1,617
)

$
45,218


$
(3,795
)

$
776,738


$
(5,412
)
Amortized cost and estimated fair value of marketable debt securities
 
June 30, 2012
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,502,255


$
1,502,405

Due after one year through five years
303,951


308,085

Due after five years through ten years
253,312


257,837

Due after ten years
785,970


793,521


$
2,845,488


$
2,861,848
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
 
Three Months Ended
(In thousands)
June 30, 2012

July 2, 2011
Proceeds from sale of available-for-sale securities
$
97,571


$
30,377

Gross realized gains on sale of available-for-sale securities
$
787


$
339

Gross realized losses on sale of available-for-sale securities
(75
)

(5
)
Net realized gains on sale of available-for-sale securities
$
712


$
334

Amortization of premiums on available-for-sale securities
$
5,619


$
2,313