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Fair Value Measurements
3 Months Ended
Apr. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The Company measures its financial assets at fair value each reporting period using a fair value hierarchy that prioritizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
Three levels of inputs may be used to measure as follows:
Level 1—Valuations based on observable inputs that reflect quoted prices for identical assets or liabilities in active markets.
Level 2—Valuations based on other inputs that are directly or indirectly observable in the marketplace.
Level 3—Valuations based on unobservable inputs that are supported by little or no market activity.
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table presents information about the Company’s financial assets that were measured at fair value on a recurring basis using the above input categories (in thousands):  
 
As of April 30, 2020
 
Level 1
 
Level 2 
 
Level 3
 
Total
 
(unaudited)
Assets:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
497,208

 
$

 
$

 
$
497,208

Corporate debt securities

 
6,006

 

 
6,006

Total cash equivalents
497,208

 
6,006

 

 
503,214

Short-term investments:
 

 
 

 
 

 
 

U.S. treasury securities

 
580,077

 

 
580,077

Corporate debt securities

 
247,479

 

 
247,479

Total short-term investments

 
827,556

 

 
827,556

Total cash equivalents and short-term investments
$
497,208

 
$
833,562

 
$

 
$
1,330,770

 
As of January 31, 2020
 
Level 1
 
Level 2 
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
416,584

 
$

 
$

 
$
416,584

U.S. treasury securities

 
19,996

 

 
19,996

Total cash equivalents
416,584

 
19,996

 

 
436,580

Short-term investments:
 

 
 

 
 

 
 

U.S. treasury securities

 
576,598

 

 
576,598

Corporate debt securities

 
306,378

 

 
306,378

Total short-term investments

 
882,976

 

 
882,976

Total cash equivalents and short-term investments
$
416,584

 
$
902,972

 
$

 
$
1,319,556


The carrying amounts of certain financial instruments, including cash held in banks, accounts receivable and accounts payable approximate fair value due to their short-term maturities and are excluded from the fair value table above.
Fair Value Measurements of Other 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):
 
As of April 30, 2020
 
Net Carrying Amount (1)
 
Estimated
Fair Value 
 
(unaudited)
2023 convertible senior notes
$
103,911

 
$
375,264

2025 convertible senior notes
$
859,889

 
$
1,126,769


(1)  
Before unamortized debt issuance costs.
The difference between the principal amount of the 2023 convertible senior notes (2023 Notes) and the 2025 convertible senior notes (2025 Notes, and together with the 2023 Notes, the Notes), $120.6 million and $1,060.0 million, respectively, and the net carrying amounts before unamortized debt issuance costs represents the unamortized debt discount (See Note 9 for additional details). The estimated fair values of the Notes, which are Level 2 financial instruments, were determined based on the quoted bid prices of the Notes in an over-the-counter market on the last trading day of the reporting period. As of April 30, 2020, the difference between the net carrying amount of the Notes and their estimated fair values represented the equity conversion value premium the market assigned to the Notes. Based on the closing price of our common stock of $151.30 on April 30, 2020, the if-converted value of the 2023 Notes exceeded the principal amount of $120.6 million, while the if-converted value of the 2025 Notes was less than the principal amount of $1,060.0 million.