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Fair Value Measurements (Tables)

3 Months Ended

Apr. 30, 2018

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, 2018 (in thousands):

Description	Level 1				Level 2				Level 3				Total
U.S. agency obligations	$	—			$	552,878			$	—			$	552,878
U.S. treasury securities	1,389,801				—				—				1,389,801
Corporate bonds	—				418,844				—				418,844
Commercial paper	—				760,984				—				760,984
Money market funds	88,571				—				—				88,571
Foreign currency derivative assets	—				6,484				—				6,484
Total assets	$	1,478,372			$	1,739,190			$	—			$	3,217,562
Foreign currency derivative liabilities	$	—			$	11,070			$	—			$	11,070
Total liabilities	$	—			$	11,070			$	—			$	11,070

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, 2018 (in thousands):

Description	Level 1				Level 2				Level 3				Total
U.S. agency obligations	$	—			$	682,424			$	—			$	682,424
U.S. treasury securities	796,835				—				—				796,835
Corporate bonds	—				469,121				—				469,121
Commercial paper	—				602,727				—				602,727
Money market funds	551,804				—				—				551,804
Foreign currency derivative assets	—				98				—				98
Total assets	$	1,348,639			$	1,754,370			$	—			$	3,103,009
Foreign currency derivative liabilities	$	—			$	32,912			$	—			$	32,912
Total liabilities	$	—			$	32,912			$	—			$	32,912

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, 2018								January 31, 2018
	Net Carrying Amount				Estimated Fair Value				Net Carrying Amount				Estimated Fair Value
0.75% Convertible senior notes	$	346,144			$	520,748			$	341,509			$	504,994
1.50% Convertible senior notes	224,107				392,463				221,378				385,550
0.25% Convertible senior notes	939,242				1,247,865				928,467				1,200,577

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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

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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