Marketable Securities (Tables)

6 Months Ended

Jul. 31, 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 July 31, 2015, January 31, 2015 and July 31, 2014 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of July 31, 2015
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	31,983	$	43	$	(1	)	$	32,025
Corporate bonds		37,961		1		(60	)		37,902
Certificates of deposit		1,999		—		—			1,999

		71,943		44		(61	)		71,926

Long-term Investments:
Municipal and pre-refunded municipal bonds		45,405		110		(6	)		45,509
Corporate bonds		17,835		1		(39	)		17,797
Certificates of deposit		4,436		—		—			4,436
Mutual funds, held in rabbi trust		4,964		66		(8	)		5,022

		72,640		177		(53	)		72,764

	$	144,583	$	221	$	(114	)	$	144,690

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
Certificates of deposit		11,127		5		—			11,132
Treasury bills		2,033		3		—			2,036
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
Certificates of deposit		3,066		—		—			3,066
Mutual funds, held in rabbi trust		3,816		16		(54	)		3,778
Treasury bills		7,111		9		—			7,120
Federal government agencies		799		2		—			801

		104,386		162		(100	)		104,448

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

As of July 31, 2014
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	29,022	$	29	$	(1	)	$	29,050
Corporate bonds		55,849		50		(15	)		55,884
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:
Municipal and pre-refunded municipal bonds		45,387		107		(18	)		45,476
Corporate bonds		93,086		96		(143	)		93,039
Certificates of deposit		2,493		—		—			2,493
Mutual funds, held in rabbi trust		3,026		68		(5	)		3,089
Treasury bills		11,264		5		—			11,269
Federal government agencies		1,777		3		—			1,780

		157,033		279		(166	)		157,146

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

- 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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