Marketable Securities (Tables)

9 Months Ended

Oct. 31, 2016

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, 2016, January 31, 2016 and October 31, 2015 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of October 31, 2016
Short-term Investments:
Corporate bonds	$	17,809	$	1	$	(19	)	$	17,791
Municipal and pre-refunded municipal bonds		6,859		—		(6	)		6,853
Certificates of deposit		—		—		—			—

		24,668		1		(25	)		24,644

Long-term Investments:
Corporate bonds		222		1		—			223
Municipal and pre-refunded municipal bonds		307		—		—			307
Mutual funds, held in rabbi trust		4,544		—		(97	)		4,447
Certificates of deposit		628		—		—			628

		5,701		1		(97	)		5,605

	$	30,369	$	2	$	(122	)	$	30,249


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of January 31, 2016
Short-term Investments:
Corporate bonds	$	33,885	$	10	$	(25	)	$	33,870
Municipal and pre-refunded municipal bonds		26,243		33		—			26,276
Certificates of deposit		915		—		—			915

		61,043		43		(25	)		61,061

Long-term Investments:
Corporate bonds		12,227		9		(35	)		12,201
Municipal and pre-refunded municipal bonds		18,028		58		(2	)		18,084
Mutual funds, held in rabbi trust		4,604		6		(247	)		4,363
Certificates of deposit		1,952		—		—			1,952

		36,811		73		(284	)		36,600

	$	97,854	$	116	$	(309	)	$	97,661


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

		69,541		50		(46	)		69,545

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

		53,775		394		(31	)		54,138

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

- 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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