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circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date. If we are required to retroactively adjust provisional amounts that we have recorded for the fair values of assets and liabilities in connection with acquisitions, these adjustments could materially decrease our operating income and net income and result in lower asset values on our balance sheet. Significant estimates and assumptions that we must make in estimating the fair value of acquired technology, customer lists, and other identifiable intangible assets include future cash flows that we expect to generate from the acquired assets. If the subsequent actual results and updated projections of the underlying business activity change compared with the assumptions and projections used to develop these values, we could record impairment charges. In addition, we have estimated the economic lives of certain acquired assets and these lives are used to calculate depreciation and amortization expense. If our estimates of the economic lives change, depreciation or amortization expenses could be accelerated or slowed.
Goodwill, Acquired Intangible Assets and Other Long-Lived Assets - Impairment Assessments
We estimate the fair value of acquired intangible assets and other long-lived assets that have finite useful lives whenever an event or change in circumstances indicates that the carrying value of the asset may not be recoverable. We test for potential impairment of goodwill and other intangible assets that have indefinite useful lives annually in our fourth fiscal quarter or whenever indicators of impairment arise. The timing of the annual test may result in charges to our statement of operations in our fourth fiscal quarter that could not have been reasonably foreseen in prior periods. As described in "Description of Business and Summary of Significant Accounting Policies - Goodwill, Acquired Intangible Assets and Other Long-Lived Assets," in Note 1 to the financial statements in Item 8 of this Report, in order to estimate the fair value of goodwill we use a weighted combination of a discounted cash flow model (known as the income approach) and comparisons to publicly traded companies engaged in similar businesses (known as the market approach). The income approach requires us to use a number of assumptions, including market factors specific to the business, the amount and timing of estimated future cash flows to be generated by the business over an extended period of time, long-term growth rates for the business, and a rate of return that considers the relative risk of achieving the cash flows and the time value of money. We evaluate cash flows at the reporting unit level and the number of reporting units that we have identified may make impairment more probable than it would be at a company with fewer reporting units and more integrated operations following acquisitions. Although the assumptions we use in our discounted cash flow model are consistent with the assumptions we use to generate our internal strategic plans and forecasts, significant judgment is required to estimate the amount and timing of future cash flows from each reporting unit and the relative risk of achieving those cash flows. When using the market approach, we make judgments about the comparability of publicly traded companies engaged in similar businesses. We base our judgments on factors such as size, growth rates, profitability, risk, and return on investment. We also make judgments when adjusting market multiples of revenue, operating income, and earnings for these companies to reflect their relative similarity to our own businesses. We had a total of
$1.2 billionin goodwill for continuing operations and $914 millionin goodwill for discontinued operations on our balance sheet at July 31, 2013. See Note 5 to the financial statements in Item 8 of this Report for a summary of goodwill by reportable segment and Note 8 for more information on goodwill for discontinued operations.