Income Taxes	6 Months Ended
Jan. 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 rate for the three months ended January 31, 2012 was approximately 34% and did not differ significantly from the federal statutory rate of 35%. The benefit we received from the domestic production activities deduction and the federal research and experimentation credit was substantially offset by state income taxes. Our effective tax rate for the three months ended January 31, 2011 was approximately 28%. Excluding discrete tax benefits primarily related to the retroactive reinstatement of the federal research and experimentation credit as described below, our effective tax rate for that quarter was approximately 36% 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 rate for the six months ended January 31, 2012 was approximately 33% and did not differ significantly from the federal statutory rate of 35%. The benefit we received from the domestic production activities deduction and the federal research and experimentation credit were substantially offset by state income taxes. We recorded a $12 million tax benefit on a pre-tax loss of $9 million for the six months ended January 31, 2011. Excluding discrete tax benefits primarily related to the retroactive reinstatement of the federal research and experimentation credit as described below, our effective tax rate for that period was approximately 36% and did not differ significantly from the 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. The decreases in the effective tax rates for the three and six months ended January 31, 2012 compared with the effective tax rates excluding discrete tax benefits for the three and six months ended January 31, 2011 were primarily related to the decrease in the California tax rate after the adoption of single sales factor apportionment effective August 1, 2011. In December 2010 the Tax Relief, Unemployment Insurance Reauthorization, and Jobs Creation Act of 2010 was signed into law. The Act included a reinstatement of the federal research and experimentation credit through December 31, 2011 that was retroactive to January 1, 2010. We recorded a discrete tax benefit of approximately $9 million for the retroactive amount related to fiscal 2010 and the first quarter of fiscal 2011 during the three months ended January 31, 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 six months ended January 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

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 rate for the three months ended January 31, 2012 was approximately 34% and did not differ significantly from the federal statutory rate of 35%. The benefit we received from the domestic production activities deduction and the federal research and experimentation credit was substantially offset by state income taxes. Our effective tax rate for the three months ended January 31, 2011 was approximately 28%. Excluding discrete tax benefits primarily related to the retroactive reinstatement of the federal research and experimentation credit as described below, our effective tax rate for that quarter was approximately 36% 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 rate for the six months ended January 31, 2012 was approximately 33% and did not differ significantly from the federal statutory rate of 35%. The benefit we received from the domestic production activities deduction and the federal research and experimentation credit were substantially offset by state income taxes. We recorded a $12 million tax benefit on a pre-tax loss of $9 million for the six months ended January 31, 2011. Excluding discrete tax benefits primarily related to the retroactive reinstatement of the federal research and experimentation credit as described below, our effective tax rate for that period was approximately 36% and did not differ significantly from the 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.

The decreases in the effective tax rates for the three and six months ended January 31, 2012 compared with the effective tax rates excluding discrete tax benefits for the three and six months ended January 31, 2011 were primarily related to the decrease in the California tax rate after the adoption of single sales factor apportionment effective August 1, 2011.

In December 2010 the Tax Relief, Unemployment Insurance Reauthorization, and Jobs Creation Act of 2010 was signed into law. The Act included a reinstatement of the federal research and experimentation credit through December 31, 2011 that was retroactive to January 1, 2010. We recorded a discrete tax benefit of approximately $9 million for the retroactive amount related to fiscal 2010 and the first quarter of fiscal 2011 during the three months ended January 31, 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 six months ended January 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.