Marketable Securities (Tables)

9 Months Ended

Oct. 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 October 31, 2015, January 31, 2015 and October 31, 2014 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of October 31, 2015
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	31,100	$	46	$	(1	)	$	31,145
Corporate bonds		37,260		4		(45	)		37,219
Certificates of deposit		1,181		—		—			1,181

		69,541		50		(46	)		69,545

Long-term Investments:
Municipal and pre-refunded municipal bonds		30,265		115		(2	)		30,378
Corporate bonds		15,210		7		(28	)		15,189
Certificates of deposit		3,460		—		—			3,460
Mutual funds, held in rabbi trust		4,840		272		(1	)		5,111

		53,775		394		(31	)		54,138

	$	123,316	$	444	$	(77	)	$	123,683

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 October 31, 2014
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	26,746	$	34	$	—		$	26,780
Corporate bonds		70,859		47		(30	)		70,876
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:
Municipal and pre-refunded municipal bonds		38,292		90		(7	)		38,375
Corporate bonds		59,504		65		(83	)		59,486
Certificates of deposit		3,686		—		—			3,686
Mutual funds, held in rabbi trust		3,399		134		(4	)		3,529
Treasury bills		8,717		9		—			8,726
Federal government agencies		798		—		—			798

		114,396		298		(94	)		114,600

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

- 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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