v2.4.0.8
Investments (Tables)
 6 Months Ended
Sep. 30, 2014
Investments [Abstract]  
Summary of available-for-sale securities
The following is a summary of available-for-sale securities at September 30, 2014 (amounts in thousands):
 
Available-for-sale Securities
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Government agency bonds
$
668,639

 
$
129

 
$
(2,560
)
 
$
666,208

Municipal bonds
41,097

 
66

 
(2
)
 
41,161

Auction rate securities
9,825

 
—

 
—

 
9,825

Time deposits (1)
20,160

 
—

 
—

 
20,160

Corporate bonds and debt
904,243

 
2,150

 
(800
)
 
905,593

 
$
1,643,964

 
$
2,345

 
$
(3,362
)
 
$
1,642,947

 
(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
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 September 30, 2014, by contractual maturity, excluding corporate debt of $6.2 million, which has 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
$
250,615

 
$
742

 
$
(5
)
 
$
251,352

Due after one year and through five years
1,264,898

 
1,552

 
(2,227
)
 
1,264,223

Due after five years and through ten years
112,436

 
51

 
(1,130
)
 
111,357

Due after ten years
9,825

 
—

 
—

 
9,825

 
$
1,637,774

 
$
2,345

 
$
(3,362
)
 
$
1,636,757