Fair Value of Financial Instruments (Tables)

3 Months Ended

Apr. 30, 2016

Schedule of Assets Measured at Fair Value

Assets measured at fair value were as follows (in thousands):

	April 30,						January 30,
	2016						2016
	Level 1		Level 2		Total		Level 1		Level 2		Total
Cash equivalents
Money market funds	$	250	$	—	$	250	$	70	$	—	$	70
Commercial paper		—		16,989		16,989		—		46,726		46,726
Total cash equivalents		250		16,989		17,239		70		46,726		46,796
Short-term investments
Commercial paper		—		17,668		17,668		—		15,488		15,488
Government agency obligations		29,844		52,583		82,427		22,011		93,302		115,313
Total short-term investments		29,844		70,251		100,095		22,011		108,790		130,801
Long-term investments
Government agency obligations		—		10,859		10,859		7,829		14,225		22,054
Total long-term investments		—		10,859		10,859		7,829		14,225		22,054
Total	$	30,094	$	98,099	$	128,193	$	29,910	$	169,741	$	199,651

Schedule of Available-for-sale Securities Maturities

The following table summarizes the amortized cost and estimated fair value of the available-for-sale securities within the Company’s investment portfolio based on stated maturities, which are recorded within cash and cash equivalents, short-term investments and long-term investments on the condensed consolidated balance sheets (in thousands):

	April 30,				January 30,
	2016				2016
	Cost		Fair Value		Cost		Fair Value
Range of maturity
Due within 1 year	$	117,028	$	117,084	$	177,564	$	177,527
Due in 1 to 2 years	$	10,838	$	10,859	$	22,033	$	22,054

Estimated Fair Value and Carrying Value of Notes

The estimated fair value and carrying value of the 2019 Notes and 2020 Notes (carrying value excludes the equity component of the 2019 Notes and 2020 Notes classified in stockholders’ equity) were as follows (in thousands):

	April 30,				January 30,
	2016				2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Convertible senior notes due 2019	$	281,181	$	304,111	$	257,624	$	300,711
Convertible senior notes due 2020	$	221,798	$	228,544	$	198,635	$	224,887