Marketable Securities (Tables)

6 Months Ended

Jul. 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 July 31, 2016, January 31, 2016 and July 31, 2015 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of July 31, 2016
Short-term Investments:
Municipal and pre-refunded municipal bonds	$	34,720	$	43	$	(4	)	$	34,759
Corporate bonds		23,658		8		(24	)		23,642
Certificates of deposit		830		—		—			830

		59,208		51		(28	)		59,231

Long-term Investments:
Municipal and pre-refunded municipal bonds		12,191		29		(1	)		12,219
Corporate bonds		8,958		8		(9	)		8,957
Mutual funds, held in rabbi trust		4,156		153		—			4,309
Certificates of deposit		515		—		—			515

		25,820		190		(10	)		26,000

	$	85,028	$	241	$	(38	)	$	85,231


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

		61,043		43		(25	)		61,061

Long-term Investments:
Municipal and pre-refunded municipal bonds		18,028		58		(2	)		18,084
Corporate bonds		12,227		9		(35	)		12,201
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
	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
Mutual funds, held in rabbi trust		4,964		66		(8	)		5,022
Certificates of deposit		4,436		—		—			4,436

		72,640		177		(53	)		72,764

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

- 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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