Fair Value Measurements (Tables)

9 Months Ended

Oct. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents the fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis as of October 31, 2017 (in thousands):  

	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market funds	$	12,334	$	—	$	—	$	12,334
Commercial paper		—		5,133		—		5,133
Corporate notes and bonds		—		6,725		—		6,725
Foreign government bonds		—		1,636		—		1,636
U.S. agency obligations		—		5,599		—		5,599
Short-term investments:
Asset-backed securities		—		68,535		—		68,535
Commercial paper		—		19,901		—		19,901
Corporate notes and bonds		—		165,448		—		165,448
Foreign government bonds		—		1,497		—		1,497
Mortgage backed securities		—		13,142		—		13,142
U.S. agency obligations		—		81,617		—		81,617
U.S. treasury securities		—		97,140		—		97,140
Total	$	12,334	$	466,373	$	—	$	478,707
Liabilities
Foreign currency derivative contracts		—		119		—		119
Total	$	—	$	119	$	—	$	119

The following table presents the fair value hierarchy for financial assets measured at fair value on a recurring basis as of January 31, 2017 (in thousands):

	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	20,174	$	—	$	—	$	20,174
Corporate notes and bonds		—		—		—		—
U.S. agency obligations		—		5,450		—		5,450
Short-term investments:
Asset-backed securities		—		20,718		—		20,718
Commercial paper		—		20,570		—		20,570
Corporate notes and bonds		—		92,756		—		92,756
U.S. agency obligations		—		87,052		—		87,052
U.S. treasury securities		—		80,170		—		80,170
Total	$	20,174	$	306,716	$	—	$	326,890

Summary of Outstanding Balance Sheet Hedges

Details on outstanding balance sheet hedges are presented below as of the date shown below (in thousands):

	October 31,
	2017
Notional amount of foreign currency derivative contracts	$	29,547
Fair value of foreign currency derivative contracts		29,666

Summary Fair Value of Outstanding Derivative Instruments

The fair value of the Company’s outstanding derivative instruments is summarized below (in thousands):

		October 31,
		2017
Derivative Liabilities	Balance Sheet Location
Derivatives not designated as hedging instruments:
Foreign currency derivative contracts	Accrued expenses	$	119