Marketable Securities (Tables)

3 Months Ended

Apr. 30, 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 April 30, 2014, January 31, 2014 and April 30, 2013 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of April 30, 2014
Short-term Investments:
Corporate bonds	$	54,678	$	30	$	(17	)	$	54,691
Municipal and pre-refunded municipal bonds		44,522		41		—			44,563
Certificates of deposit		23,348		10		(1	)		23,357
Commercial paper		24,678		6		—			24,684
Treasury bills		2,498		3		—			2,501

		149,724		90		(18	)		149,796


Long-term Investments:
Corporate bonds		85,583		168		(31	)		85,720
Municipal and pre-refunded municipal bonds		68,511		178		(14	)		68,675
Certificates of deposit		1,499		1		—			1,500
Treasury bills		15,404		9		—			15,413
Mutual funds, held in rabbi trust		2,579		33		(12	)		2,600
Federal government agencies		1,782		4		—			1,786

		175,358		393		(57	)		175,694

	$	325,082	$	483	$	(75	)	$	325,490


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
Commercial paper		35,101		7		(1	)		35,107
Treasury bills		24,873		10		—			24,883

		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 April 30, 2013
Short-term Investments:
Corporate bonds	$	76,563	$	49	$	(26	)	$	76,586
Municipal and pre-refunded municipal bonds		75,507		58		(1	)		75,564
Certificate of deposit		40,222		23		—			40,245
Commercial paper		8,476		6		—			8,482
Treasury bills		12,060		1		—			12,061
Federal government agencies		2,000		—		—			2,000

		214,828		137		(27	)		214,938


Long-term Investments:
Corporate bonds		76,717		117		(44	)		76,790
Municipal and pre-refunded municipal bonds		50,913		121		(4	)		51,030
Certificate of deposit		2,099		1		—			2,100
Treasury bills		9,666		4		—			9,670
Mutual funds, held in rabbi trust		328		9		—			337
Federal government agencies		9,845		—		(1	)		9,844

		149,568		252		(49	)		149,771

	$	364,396	$	389	$	(76	)	$	364,709

- 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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