Income Taxes	3 Months Ended
Oct. 31, 2011
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate We compute our provision for or benefit from income taxes by applying the estimated annual effective tax rate to income or loss from recurring operations and adding the effects of any discrete income tax items specific to the period. Our effective tax benefit rate for the three months ended October 31, 2011 was approximately 35% and did not differ significantly from the federal statutory rate of 35%. State income taxes were substantially offset by the benefit we received from the domestic production activities deduction and the federal research and experimentation credit. Our effective tax benefit rate for the three months ended October 31, 2010 was approximately 37%. This differed from the federal statutory rate of 35% primarily due to state income taxes, which were partially offset by the benefit we received from the domestic production activities deduction. The decrease in the effective tax benefit rate for the three months ended October 31, 2011 compared with the three months ended October 31, 2010 was primarily related to the decrease in the California tax rate after the adoption of single sales factor apportionment effective August 1, 2011. Unrecognized Tax Benefits and Other Considerations The total amount of our unrecognized tax benefits at July 31, 2011 was $41 million. Net of related deferred tax assets, unrecognized tax benefits were $35 million at that date. If we were to recognize these net benefits, our income tax expense would reflect a favorable net impact of $35 million. There were no material changes to these amounts during the three months ended October 31, 2011. We do not believe that it is reasonably possible that there will be a significant increase or decrease in our unrecognized tax benefits over the next 12 months.

Income Taxes

3 Months Ended

Oct. 31, 2011

Effective Tax Rate

We compute our provision for or benefit from income taxes by applying the estimated annual effective tax rate to income or loss from recurring operations and adding the effects of any discrete income tax items specific to the period. Our effective tax benefit rate for the three months ended October 31, 2011 was approximately 35% and did not differ significantly from the federal statutory rate of 35%. State income taxes were substantially offset by the benefit we received from the domestic production activities deduction and the federal research and experimentation credit. Our effective tax benefit rate for the three months ended October 31, 2010 was approximately 37%. This differed from the federal statutory rate of 35% primarily due to state income taxes, which were partially offset by the benefit we received from the domestic production activities deduction.

The decrease in the effective tax benefit rate for the three months ended October 31, 2011 compared with the three months ended October 31, 2010 was primarily related to the decrease in the California tax rate after the adoption of single sales factor apportionment effective August 1, 2011.

Unrecognized Tax Benefits and Other Considerations

The total amount of our unrecognized tax benefits at July 31, 2011 was $41 million. Net of related deferred tax assets, unrecognized tax benefits were $35 million at that date. If we were to recognize these net benefits, our income tax expense would reflect a favorable net impact of $35 million. There were no material changes to these amounts during the three months ended October 31, 2011. We do not believe that it is reasonably possible that there will be a significant increase or decrease in our unrecognized tax benefits over the next 12 months.