Income Taxes	6 Months Ended
Jan. 31, 2013
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. In January 2013 the American Taxpayer Relief Act of 2012 was signed into law. The Act includes a reinstatement of the federal research and experimentation credit through December 31, 2013 that was retroactive to January 1, 2012. We recorded a discrete tax benefit of approximately $12 million for the retroactive effect during the three months ended January 31, 2013. Our effective tax rate for the three months ended January 31, 2013 was approximately 18% and we recorded an $8 million tax benefit on pretax income of $12 million for the six months ended January 31, 2013. Excluding discrete tax benefits primarily related to the reinstatement of the federal research and experimentation credit, our effective tax rate for the three and six months ended January 31, 2013 was approximately 33% 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 in both periods. Our effective tax rates for the three and six months ended January 31, 2012 were approximately 34% and 33% 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 in both periods. 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 six months ended January 31, 2013. 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

6 Months Ended

Jan. 31, 2013

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.

In January 2013 the American Taxpayer Relief Act of 2012 was signed into law. The Act includes a reinstatement of the federal research and experimentation credit through December 31, 2013 that was retroactive to January 1, 2012. We recorded a discrete tax benefit of approximately $12 million for the retroactive effect during the three months ended January 31, 2013.

Our effective tax rate for the three months ended January 31, 2013 was approximately 18% and we recorded an $8 million tax benefit on pretax income of $12 million for the six months ended January 31, 2013. Excluding discrete tax benefits primarily related to the reinstatement of the federal research and experimentation credit, our effective tax rate for the three and six months ended January 31, 2013 was approximately 33% 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 in both periods.

Our effective tax rates for the three and six months ended January 31, 2012 were approximately 34% and 33% 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 in both periods.

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 six months ended January 31, 2013. 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.