Income Taxes	3 Months Ended
Oct. 31, 2012
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, 2012 was approximately 32%. Excluding the impact of discrete tax items primarily related to share-based compensation, our effective tax benefit rate for the three months ended October 31, 2012 was approximately 35% and did not differ significantly from the federal statutory rate of 35%. The benefit we received from the domestic production activities deduction was substantially offset by state income taxes. 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%. The benefits we received from the domestic production activities deduction and the federal research and experimentation credit were substantially offset by state income taxes. Unrecognized Tax Benefits and Other Considerations The total amount of our unrecognized tax benefits at July 31, 2012 was $38 million. Net of related deferred tax assets, unrecognized tax benefits were $28 million at that date. If we were to recognize these net benefits, our income tax expense would reflect a favorable net impact of $28 million. There were no material changes to these amounts during the three months ended October 31, 2012. 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, 2012

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, 2012 was approximately 32%. Excluding the impact of discrete tax items primarily related to share-based compensation, our effective tax benefit rate for the three months ended October 31, 2012 was approximately 35% and did not differ significantly from the federal statutory rate of 35%. The benefit we received from the domestic production activities deduction was substantially offset by state income taxes. 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%. The benefits we received from the domestic production activities deduction and the federal research and experimentation credit were substantially offset by state income taxes.

Unrecognized Tax Benefits and Other Considerations

The total amount of our unrecognized tax benefits at July 31, 2012 was $38 million. Net of related deferred tax assets, unrecognized tax benefits were $28 million at that date. If we were to recognize these net benefits, our income tax expense would reflect a favorable net impact of $28 million. There were no material changes to these amounts during the three months ended October 31, 2012. 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.