Fair Value of Financial Instruments (Tables)

12 Months Ended

Jan. 30, 2016

Schedule of Assets Measured at Fair Value

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

	January 30,						January 31,
	2016						2015
	Level 1		Level 2		Total		Level 1		Level 2		Total
Cash equivalents
Money market funds	$	70	$	—	$	70	$	44	$	—	$	44
Commercial paper		—		46,726		46,726		—		18,248		18,248
Government agency obligations		—		—		—		—		1,001		1,001
Total cash equivalents		70		46,726		46,796		44		19,249		19,293
Short-term investments
Commercial paper		—		15,488		15,488		—		13,996		13,996
Government agency obligations		22,011		93,302		115,313		—		48,172		48,172
Total short-term investments		22,011		108,790		130,801		—		62,168		62,168
Long-term investments
Government agency obligations		7,829		14,225		22,054		—		18,338		18,338
Total long-term investments		7,829		14,225		22,054		—		18,338		18,338
Total	$	29,910	$	169,741	$	199,651	$	44	$	99,755	$	99,799

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 consolidated balance sheets (in thousands):

	January 30,				January 31,
	2016				2015
	Cost		Fair Value		Cost		Fair Value
Range of maturity
Due within 1 year	$	177,564	$	177,527	$	81,413	$	81,419
Due in 1 to 2 years	$	22,033	$	22,054	$	18,324	$	18,338

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):

	January 30,				January 31,
	2016				2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Convertible senior notes due 2019	$	257,624	$	300,711	$	260,444	$	287,487
Convertible senior notes due 2020	$	198,635	$	224,887	$	—	$	—