Marketable Securities (Tables)

12 Months Ended

Jan. 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 values of available-for-sale securities by major security type and class of security as of January 31, 2016 and 2015 are as follows:


	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		(Losses)			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

As of January 31, 2015
Short-term Investments:
Corporate bonds	$	56,594	$	20	$	(24	)	$	56,590
Municipal and pre-refunded municipal bonds		30,509		41		(2	)		30,548
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:
Corporate bonds		46,754		22		(40	)		46,736
Municipal and pre-refunded municipal bonds		42,840		113		(6	)		42,947
Mutual funds, held in rabbi trust		3,816		16		(54	)		3,778
Certificates of deposit		3,066		—		—			3,066
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

Gross Unrealized Losses and Fair Value of Marketable Securities

The following tables show the gross unrealized losses and fair value of the Company’s marketable securities with unrealized losses that are not deemed to be other-than-temporarily impaired aggregated by the length of time that individual securities have been in a continuous unrealized loss position, at January 31, 2016 and January 31, 2015, respectively.


	January 31, 2016
	Less Than 12 Months					12 Months or Greater					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	30,745	$	(54	)	$	1,098	$	(6	)	$	31,843	$	(60	)
Municipal and pre-refunded municipal bonds		997		(2	)		434		—			1,431		(2	)
Mutual funds, held in rabbi trust		4,363		(247	)		—		—			4,363		(247	)

Total	$	36,105	$	(303	)	$	1,532	$	(6	)	$	37,637	$	(309	)


	January 31, 2015
	Less Than 12 Months					12 Months or Greater					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	55,384	$	(63	)	$	383	$	(1	)	$	55,767	$	(64	)
Municipal and pre-refunded municipal bonds		4,672		(8	)		—		—			4,672		(8	)
Mutual funds, held in rabbi trust		3,778		(54	)		—		—			3,778		(54	)
Certificates of deposit		1,600		—			—		—			1,600		—
Commercial paper		747		—			—		—			747		—

Total	$	66,181	$	(125	)	$	383	$	(1	)	$	66,564	$	(126	)

- 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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