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Accounting Standards	6 Months Ended
Accounting Standards	Jul. 31, 2021
Accounting Policies [Abstract]
Accounting Standards	Accounting Standards Recently Adopted Accounting Pronouncements ASU No. 2020-06 In August 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40). Under ASU No. 2020-06, the embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives under Topic 815, or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. The new guidance also requires the if-converted method to be applied for all convertible instruments when calculating diluted earnings per share. We adopted this standard effective February 1, 2021, using a modified retrospective method, under which financial results reported in prior periods were not adjusted. We applied the provisions of this guidance to our 0.25% convertible senior notes due October 1, 2022 (“2022 Notes”). Upon adoption, we recorded a decrease to Accumulated deficit of $136 million, a decrease to Additional paid-in capital of $220 million, an increase to Debt, current of $79 million, and a decrease to Property and equipment, net of $5 million, which represented non-cash interest previously capitalized. For further information, see Note 11, Debt. Recently Issued Accounting Pronouncements ASU No. 2020-04 and ASU No. 2021-01 In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides temporary optional expedients and exceptions to GAAP guidance on contract modifications to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate to alternative reference rates. In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848), which refines the scope of Topic 848 and clarifies some of its guidance. We may elect to apply the amendments prospectively through December 31, 2022. The impact on our condensed consolidated financial statements from the adoption of this standard is expected to be immaterial.