Income Taxes	3 Months Ended
Apr. 30, 2017
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 a tax expense of $2 million and $1 million for the three months ended April 30, 2017 and 2016, respectively. The income tax provision for each of the three month periods ended April 30, 2017 and 2016 was primarily attributable to state taxes and income tax expense 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 April 30, 2017, we intend to continue maintaining a full valuation allowance on our deferred tax assets except for certain jurisdictions.

Income Taxes

3 Months Ended

Apr. 30, 2017

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 a tax expense of $2 million and $1 million for the three months ended April 30, 2017 and 2016, respectively. The income tax provision for each of the three month periods ended April 30, 2017 and 2016 was primarily attributable to state taxes and income tax expense 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 April 30, 2017, we intend to continue maintaining a full valuation allowance on our deferred tax assets except for certain jurisdictions.