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Fair Value Measurements (Tables)

3 Months Ended

Apr. 30, 2019

Fair Value Disclosures [Abstract]

Information about Assets that are Measured at Fair Value on a Recurring Basis

The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of April 30, 2019 (in thousands):

	Level 1				Level 2				Level 3				Total
U.S. treasury securities	$	484,981			$	—			$	—			$	484,981
U.S. agency obligations	—				188,113				—				188,113
Corporate bonds	—				374,462				—				374,462
Commercial paper	—				282,529				—				282,529
Money market funds	396,940				—				—				396,940
Foreign currency derivative assets	—				35,238				—				35,238
Total assets	$	881,921			$	880,342			$	—			$	1,762,263
Foreign currency derivative liabilities	$	—			$	752			$	—			$	752
Total liabilities	$	—			$	752			$	—			$	752

The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of January 31, 2019 (in thousands):

	Level 1				Level 2				Level 3				Total
U.S. treasury securities	$	396,230			$	—			$	—			$	396,230
U.S. agency obligations	—				241,836				—				241,836
Corporate bonds	—				419,768				—				419,768
Commercial paper	—				254,173				—				254,173
Money market funds	237,071				—				—				237,071
Marketable equity investments	44,127				—				—				44,127
Foreign currency derivative assets	—				22,570				—				22,570
Total assets	$	677,428			$	938,347			$	—			$	1,615,775
Foreign currency derivative liabilities	$	—			$	3,135			$	—			$	3,135
Total liabilities	$	—			$	3,135			$	—			$	3,135

Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments

The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the condensed consolidated balance sheets (in thousands): 

	April 30, 2019								January 31, 2019
	Net Carrying Amount				Estimated Fair Value				Net Carrying Amount				Estimated Fair Value
1.50% Convertible senior notes	$	235,408			$	590,566			$	232,514			$	557,074
0.25% Convertible senior notes	983,507				1,707,750				972,264				1,560,228

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- References

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- Definition

Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

+ References

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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