Marketable Securities (Tables)

6 Months Ended

Jul. 31, 2014

Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities

The amortized cost, gross unrealized gains (losses) and fair value of available-for-sale securities by major security type and class of security as of July 31, 2014, January 31, 2014 and July 31, 2013 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of July 31, 2014
Short-term Investments:
Corporate bonds	$	55,849	$	50	$	(15	)	$	55,884
Municipal and pre-refunded municipal bonds		29,022		29		(1	)		29,050
Certificates of deposit		14,348		9		—			14,357
Treasury bills		4,530		4		—			4,534
Commercial paper		2,892		4		—			2,896

		106,641		96		(16	)		106,721

Long-term Investments:
Corporate bonds		93,086		96		(143	)		93,039
Municipal and pre-refunded municipal bonds		45,387		107		(18	)		45,476
Certificates of deposit		2,493		—		—			2,493
Treasury bills		11,264		5		—			11,269
Mutual funds, held in rabbi trust		3,026		68		(5	)		3,089
Federal government agencies		1,777		3		—			1,780

		157,033		279		(166	)		157,146

	$	263,674	$	375	$	(182	)	$	263,867

As of January 31, 2014
Short-term Investments:
Corporate bonds	$	100,856	$	56	$	(41	)	$	100,871
Municipal and pre-refunded municipal bonds		85,000		98		(2	)		85,096
Certificates of deposit		35,844		13		(1	)		35,856
Treasury bills		24,873		10		—			24,883
Commercial paper		35,101		7		(1	)		35,107

		281,674		184		(45	)		281,813

Long-term Investments:
Corporate bonds		208,446		268		(162	)		208,552
Municipal and pre-refunded municipal bonds		125,934		415		(8	)		126,341
Certificates of deposit		4,000		—		(2	)		3,998
Treasury bills		21,551		21		—			21,572
Mutual funds, held in rabbi trust		1,591		108		(33	)		1,666
Federal government agencies		4,287		6		—			4,293

		365,809		818		(205	)		366,422

	$	647,483	$	1,002	$	(250	)	$	648,235


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of July 31, 2013
Short-term Investments:
Corporate bonds	$	79,637	$	22	$	(37	)	$	79,622
Municipal and pre-refunded municipal bonds		91,819		61		(9	)		91,871
Certificates of deposit		29,870		24		—			29,894
Treasury bills		16,115		5		—			16,120
Commercial paper		8,284		8		—			8,292

		225,725		120		(46	)		225,799

Long-term Investments:
Corporate bonds		95,795		51		(239	)		95,607
Municipal and pre-refunded municipal bonds		100,402		142		(54	)		100,490
Certificates of deposit		3,801		1		(2	)		3,800
Treasury bills		8,218		6		—			8,224
Mutual funds, held in rabbi trust		817		35		—			852
Federal government agencies		7,800		—		(7	)		7,793

		216,833		235		(302	)		216,766

	$	442,558	$	355	$	(348	)	$	442,565

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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