Marketable Securities (Tables)

3 Months Ended

Apr. 30, 2017

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 April 30, 2017, January 31, 2017 and April 30, 2016 were as follows:


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of April 30, 2017
Short-term Investments:
Corporate bonds	$	77,313	$	4	$	(58	)	$	77,259
Municipal and pre-refunded municipal bonds		40,788		24		(3	)		40,809
Certificates of deposit		425		—		—			425

		118,526		28		(61	)		118,493

Long-term Investments:
Corporate bonds		27,586		3		(36	)		27,553
Municipal and pre-refunded municipal bonds		4,758		17		—			4,775
Mutual funds, held in rabbi trust		5,011		62		(1	)		5,072
Certificates of deposit		1,051		—		—			1,051

		38,406		82		(37	)		38,451

	$	156,932	$	110	$	(98	)	$	156,944

As of January 31, 2017
Short-term Investments:
Corporate bonds	$	59,403	$	7	$	(90	)	$	59,320
Municipal and pre-refunded municipal bonds		51,731		28		(12	)		51,747

		111,134		35		(102	)		111,067

Long-term Investments:
Corporate bonds		19,102		9		(33	)		19,078
Municipal and pre-refunded municipal bonds		19,488		35		(9	)		19,514
Mutual funds, held in rabbi trust		4,583		91		(1	)		4,673
Certificates of deposit		1,023		—		—			1,023

		44,196		135		(43	)		44,288

	$	155,330	$	170	$	(145	)	$	155,355


	Amortized Cost		Unrealized Gains		Unrealized (Losses)			Fair Value
As of April 30, 2016
Short-term Investments:
Corporate bonds	$	18,972	$	5	$	(7	)	$	18,970
Municipal and pre-refunded municipal bonds		40,569		27		(2	)		40,594

		59,541		32		(9	)		59,564

Long-term Investments:
Corporate bonds		5,356		2		(10	)		5,348
Municipal and pre-refunded municipal bonds		9,060		20		(1	)		9,079
Mutual funds, held in rabbi trust		3,907		30		(3	)		3,934
Certificates of deposit		349		—		—			349

		18,672		52		(14	)		18,710

	$	78,213	$	84	$	(23	)	$	78,274

- 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.

+ References + Details