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Income Taxes
 6 Months Ended
Jul. 31, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
We compute the year-to-date income tax provision by applying the estimated annual effective tax rate to the year-to-date pre-tax income or loss and adjust for discrete tax items in the period. We reported an income tax benefit of $5 million and an income tax expense of $3 million for the six months ended July 31, 2021, and 2020, respectively. The income tax benefit for the six months ended July 31, 2021, was primarily attributable to excess tax benefit from stock option deductions in foreign jurisdictions and reversal of previously accrued tax liabilities upon favorable tax audit results. The income tax expense for the six months ended July 31, 2020, was primarily attributable to state taxes and income tax expenses in profitable foreign jurisdictions.
We are subject to income tax audits in the U.S. and foreign jurisdictions. We record liabilities related to uncertain tax positions and believe that we have provided adequate reserves for income tax uncertainties in all open tax years. Due to our history of tax losses, all years remain open to tax audit.
We periodically evaluate the realizability of our net deferred tax assets based on all available evidence, both positive and negative. The realization of net deferred tax assets is dependent on our ability to generate sufficient future taxable income during periods prior to the expiration of tax attributes to fully utilize these assets. As of July 31, 2021, we continue to maintain a full valuation allowance on our deferred tax assets except in certain jurisdictions.