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Fair Value Measurements (Tables)

6 Months Ended

Jul. 31, 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 July 31, 2019 (in thousands):

	Level 1				Level 2				Level 3				Total
U.S. treasury securities	$	524,985			$	—			$	—			$	524,985
U.S. agency obligations	—				240,218				—				240,218
Corporate bonds	—				439,923				—				439,923
Commercial paper	—				182,886				—				182,886
Money market funds	348,109				—				—				348,109
Foreign currency derivative assets	—				53,135				—				53,135
Total assets	$	873,094			$	916,162			$	—			$	1,789,256
Foreign currency derivative liabilities	$	—			$	518			$	—			$	518
Total liabilities	$	—			$	518			$	—			$	518

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):

	July 31, 2019								January 31, 2019
	Net Carrying Amount				Estimated Fair Value				Net Carrying Amount				Estimated Fair Value
1.50% Convertible senior notes	$	238,317			$	662,362			$	232,514			$	557,074
0.25% Convertible senior notes	994,872				1,718,100				972,264				1,560,228

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- References

No definition available.

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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

No definition available.

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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