Marketable Securities (Tables)

9 Months Ended

Oct. 31, 2013

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, 2013, January 31, 2013 and October 31, 2012 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
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
Commercial paper		28,159		10		(2	)		28,167
Treasury bills		10,079		3		—			10,082

		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
Federal government agencies		8,784		4		—			8,788
Mutual funds, held in rabbi trust		1,236		92		—			1,328

		302,730		627		(157	)		303,200

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

As of January 31, 2013
Short-term Investments:
Corporate bonds	$	88,432	$	106	$	(23	)	$	88,515
Municipal and pre-refunded municipal bonds		63,355		85		(17	)		63,423
Certificates of deposit		40,870		25		—			40,895
Commercial paper		10,775		8		(2	)		10,781
Treasury bills		21,354		14		—			21,368
Federal government agencies		3,500		4		—			3,504

		228,286		242		(42	)		228,486

Long-term Investments:
Corporate bonds		64,219		102		(61	)		64,260
Municipal and pre-refunded municipal bonds		52,925		76		(60	)		52,941
Certificates of deposit		2,340		—		—			2,340
Treasury bills		19,724		13		—			19,737
Federal government agencies		5,974		5		(2	)		5,977
Auction rate securities		4,925		—		(595	)		4,330

		150,107		196		(718	)		149,585

	$	378,393	$	438	$	(760	)	$	378,071

As of October 31, 2012
Short-term Investments:
Corporate bonds	$	64,975	$	89	$	(7	)	$	65,057
Municipal and pre-refunded municipal bonds		29,937		98		(6	)		30,029
Certificate of deposit		28,676		28		—			28,704
Commercial paper		8,178		11		—			8,189
Treasury bills		10,582		4		—			10,586
Federal government agencies		3,500		—		—			3,500

		145,848		230		(13	)		146,065

Long-term Investments:
Corporate bonds		46,507		155		(57	)		46,605
Municipal and pre-refunded municipal bonds		21,456		47		(27	)		21,476
Certificate of deposit		1,925		1		—			1,926
Treasury bills		18,211		7		(1	)		18,217
Federal government agencies		1,211		2		—			1,213
Auction rate securities		4,925		—		(595	)		4,330

		94,235		212		(680	)		93,767

	$	240,083	$	442	$	(693	)	$	239,832

- 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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