Marketable Securities (Tables)

3 Months Ended

Apr. 30, 2015

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, 2015, January 31, 2015 and April 30, 2014 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of April 30, 2015
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	40,287	$	42	$	(2	)	$	40,327
Corporate bonds		43,923		12		(28	)		43,907
Treasury bills		3,018		2		—			3,020
Certificates of deposit		5,426		1		—			5,427
Commercial paper		3,942		3		—			3,945

		96,596		60		(30	)		96,626

Long-term Investments:
Municipal and pre-refunded municipal bonds		46,529		78		(10	)		46,597
Corporate bonds		20,652		8		(30	)		20,630
Treasury bills		8,067		3		(1	)		8,069
Certificates of deposit		2,566		—		—			2,566
Mutual funds, held in rabbi trust		4,670		40		(24	)		4,686
Federal government agencies		799		1		—			800

		83,283		130		(65	)		83,348

	$	179,879	$	190	$	(95	)	$	179,974

As of January 31, 2015
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	30,509	$	41	$	(2	)	$	30,548
Corporate bonds		56,594		20		(24	)		56,590
Treasury bills		2,033		3		—			2,036
Certificates of deposit		11,127		5		—			11,132
Commercial paper		3,938		2		—			3,940

		104,201		71		(26	)		104,246

Long-term Investments:
Municipal and pre-refunded municipal bonds		42,840		113		(6	)		42,947
Corporate bonds		46,754		22		(40	)		46,736
Treasury bills		7,111		9		—			7,120
Certificates of deposit		3,066		—		—			3,066
Mutual funds, held in rabbi trust		3,816		16		(54	)		3,778
Federal government agencies		799		2		—			801

		104,386		162		(100	)		104,448

	$	208,587	$	233	$	(126	)	$	208,694

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

		149,724		90		(18	)		149,796

Long-term Investments:
Municipal and pre-refunded municipal bonds		68,511		178		(14	)		68,675
Corporate bonds		85,583		168		(31	)		85,720
Treasury bills		15,404		9		—			15,413
Certificates of deposit		1,499		1		—			1,500
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

- 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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