Marketable Securities (Tables)

9 Months Ended

Oct. 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 October 31, 2014, January 31, 2014 and October 31, 2013 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of October 31, 2014
Short-term Investments:
Corporate bonds	$	70,859	$	47	$	(30	)	$	70,876
Municipal and pre-refunded municipal bonds		26,746		34		—			26,780
Certificates of deposit		11,978		4		—			11,982
Commercial paper		3,592		1		—			3,593
Federal government agencies		1,771		3		—			1,774

		114,946		89		(30	)		115,005

Long-term Investments:
Corporate bonds		59,504		65		(83	)		59,486
Municipal and pre-refunded municipal bonds		38,292		90		(7	)		38,375
Certificates of deposit		3,686		—		—			3,686
Treasury bills		8,717		9		—			8,726
Mutual funds, held in rabbi trust		3,399		134		(4	)		3,529
Federal government agencies		798		—		—			798

		114,396		298		(94	)		114,600

	$	229,342	$	387	$	(124	)	$	229,605

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

As of October 31, 2013
Short-term Investments:
Corporate bonds	$	77,806	$	37	$	(25	)	$	77,818
Municipal and pre-refunded municipal bonds		84,662		71		(3	)		84,730
Certificates of deposit		26,733		17		—			26,750
Treasury bills		10,079		3		—			10,082
Commercial paper		28,159		10		(2	)		28,167

		227,439		138		(30	)		227,547

Long-term Investments:
Corporate bonds		156,170		197		(144	)		156,223
Municipal and pre-refunded municipal bonds		122,356		324		(13	)		122,667
Certificates of deposit		2,001		1		—			2,002
Treasury bills		12,183		9		—			12,192
Mutual funds, held in rabbi trust		1,236		92		—			1,328
Federal government agencies		8,784		4		—			8,788

		302,730		627		(157	)		303,200

	$	530,169	$	765	$	(187	)	$	530,747

- 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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