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Investments (Tables)
 12 Months Ended
Mar. 31, 2015
Investments [Abstract]  
Summary of available-for-sale securities
The following is a summary of available-for-sale securities at March 31, 2015 (amounts in thousands):
 
Available-for-sale Securities
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Government agency bonds
$
741,780

 
$
676

 
$
(200
)
 
$
742,256

Municipal bonds
41,552

 
155

 
(9
)
 
41,698

Auction rate securities
9,825

 
—

 
—

 
9,825

Time deposits (1)
506

 
—

 
—

 
506

Corporate bonds and debt
924,818

 
2,376

 
(265
)
 
926,929

Marketable equity securities
1,362

 
11,804

 
—

 
13,166

 
$
1,719,843

 
$
15,011

 
$
(474
)
 
$
1,734,380

 
(1) Time deposits in various financial institutions with maturities greater than three months that will mature within one year.

The following is a summary of available-for-sale securities at March 31, 2014 (amounts in thousands):
 
Available-for-sale Securities
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Government agency bonds
$
684,451

 
$
114

 
$
(3,171
)
 
$
681,394

Municipal bonds
41,622

 
101

 
(14
)
 
41,709

Auction rate securities
9,825

 
—

 
—

 
9,825

Corporate bonds and debt
941,524

 
3,247

 
(805
)
 
943,966

 
$
1,677,422

 
$
3,462

 
$
(3,990
)
 
$
1,676,894
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
The following tables show all investments in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (amounts in thousands):
 
March 31, 2015
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Government agency bonds
$
162,948

 
$
(142
)
 
$
29,942

 
$
(58
)
 
$
192,890

 
$
(200
)
Municipal bonds
13,318

 
(9
)
 
—

 
—

 
13,318

 
(9
)
Corporate bonds and debt
163,095

 
(219
)
 
19,021

 
(46
)
 
182,116

 
(265
)
 
$
339,361

 
$
(370
)
 
$
48,963

 
$
(104
)
 
$
388,324

 
$
(474
)

 
March 31, 2014
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Government agency bonds
$
522,159

 
$
(3,171
)
 
$
—

 
$
—

 
$
522,159

 
$
(3,171
)
Municipal bonds
2,625

 
(13
)
 
1,196

 
(1
)
 
3,821

 
(14
)
Corporate bonds and debt
256,717

 
(805
)
 
—

 
—

 
256,717

 
(805
)
 
$
781,501

 
$
(3,989
)
 
$
1,196

 
$
(1
)
 
$
782,697

 
$
(3,990
)
Summary of amortized cost and estimated fair value of available-for-sale securities, by maturity
The amortized cost and estimated fair value of the available-for-sale securities at March 31, 2015, by contractual maturity, excluding marketable equity securities of $13.2 million and corporate debt of $6.2 million, which have no contractual maturity, are shown below (amounts in thousands). Expected maturities can differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties, and the Company views its available-for-sale securities as available for current operations.
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale
 
 
 
 
 
 
 
Due in one year or less
$
224,531

 
$
512

 
$
(34
)
 
$
225,009

Due after one year and through five years
1,395,685

 
2,648

 
(330
)
 
1,398,003

Due after five years and through ten years
82,250

 
47

 
(110
)
 
82,187

Due after ten years
9,825

 
—

 
—

 
9,825

 
$
1,712,291

 
$
3,207

 
$
(474
)
 
$
1,715,024

 
The amortized cost and estimated fair value of the available-for-sale securities at March 31, 2014, by maturity, excluding corporate debt of $6.2 million, which has no contractual maturity, are shown below (amounts in thousands). 
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale
 
 
 
 
 
 
 
Due in one year or less
$
210,129

 
$
1,234

 
$
—

 
$
211,363

Due after one year and through five years
1,308,844

 
2,228

 
(1,958
)
 
1,309,114

Due after five years and through ten years
142,434

 
—

 
(2,032
)
 
140,402

Due after ten years
9,825

 
—

 
—

 
9,825

 
$
1,671,232

 
$
3,462

 
$
(3,990
)
 
$
1,670,704