Income Taxes	9 Months Ended
Oct. 26, 2014
Notes to financial statements [Abstract]
Income Taxes	Income Taxes We recognized income tax expense of $36.1 million and $89.5 million for the three and nine months ended October 26, 2014, respectively, and $22.8 million and $48.3 million for the three and nine months ended October 27, 2013, respectively. Income tax expense as a percentage of income before taxes, or our effective tax rate, was 17.3% and 17.0% for the three and nine months ended October 26, 2014, respectively, and 16.1% and 14.2% for the three and nine months ended October 27, 2013, respectively. The increase in our effective tax rate in fiscal year 2015 as compared to the same period in the prior fiscal year was primarily related to the expiration of the U.S. federal research tax credit on December 31, 2013 which resulted in no tax benefit in the nine months ended October 26, 2014. Our effective tax rate on income before tax for the first nine months of fiscal year 2015 of 17.0% was lower than the United States federal statutory rate of 35% due primarily to income earned in jurisdictions where the tax rate is lower than the United States federal statutory tax rate. Further, our effective tax rate for the first nine months of fiscal year 2015 of 17.0% differs from our annual projected effective tax rate for the first nine months of fiscal year 2015 of 18.5% due to discrete events that occurred in the first nine months of fiscal year 2015 primarily attributable to the tax benefits recognized upon the expiration of statutes of limitations in certain non-U.S. jurisdictions. Our effective tax rate on income before tax for the first nine months of fiscal year 2014 of 14.2% was lower than the United States federal statutory rate of 35% due primarily to income earned in jurisdictions where the tax rate is lower than the United States federal statutory tax and the benefit of the U.S. federal research tax credit. For the nine months ended October 26, 2014, there have been no material changes to our tax years that remain subject to examination by major tax jurisdictions. Additionally, there have been no other material changes to our unrecognized tax benefits and any related interest or penalties since the fiscal year ended January 26, 2014, other than the recognition of tax benefits upon the expiration of statute of limitation in certain non-U.S. jurisdictions in the nine months ended October 26, 2014. While we believe that we have adequately provided for all uncertain tax positions, or tax positions where it is believed not more-likely-than-not that the position will be sustained upon examination, amounts asserted by tax authorities could be greater or less than our accrued position. Accordingly, our provisions on federal, state and foreign tax related matters to be recorded in the future may change as revised estimates are made or the underlying matters are settled or otherwise resolved with the respective tax authorities. As of October 26, 2014, we do not believe that our estimates, as otherwise provided for, on such tax positions will significantly increase or decrease within the next twelve months.

Income Taxes

We recognized income tax expense of $36.1 million and $89.5 million for the three and nine months ended October 26, 2014, respectively, and $22.8 million and $48.3 million for the three and nine months ended October 27, 2013, respectively. Income tax expense as a percentage of income before taxes, or our effective tax rate, was 17.3% and 17.0% for the three and nine months ended October 26, 2014, respectively, and 16.1% and 14.2% for the three and nine months ended October 27, 2013, respectively.

The increase in our effective tax rate in fiscal year 2015 as compared to the same period in the prior fiscal year was primarily related to the expiration of the U.S. federal research tax credit on December 31, 2013 which resulted in no tax benefit in the nine months ended October 26, 2014.

Our effective tax rate on income before tax for the first nine months of fiscal year 2015 of 17.0% was lower than the United States federal statutory rate of 35% due primarily to income earned in jurisdictions where the tax rate is lower than the United States federal statutory tax rate. Further, our effective tax rate for the first nine months of fiscal year 2015 of 17.0% differs from our annual projected effective tax rate for the first nine months of fiscal year 2015 of 18.5% due to discrete events that occurred in the first nine months of fiscal year 2015 primarily attributable to the tax benefits recognized upon the expiration of statutes of limitations in certain non-U.S. jurisdictions.

Our effective tax rate on income before tax for the first nine months of fiscal year 2014 of 14.2% was lower than the United States federal statutory rate of 35% due primarily to income earned in jurisdictions where the tax rate is lower than the United States federal statutory tax and the benefit of the U.S. federal research tax credit.

For the nine months ended October 26, 2014, there have been no material changes to our tax years that remain subject to examination by major tax jurisdictions. Additionally, there have been no other material changes to our unrecognized tax benefits and any related interest or penalties since the fiscal year ended January 26, 2014, other than the recognition of tax benefits upon the expiration of statute of limitation in certain non-U.S. jurisdictions in the nine months ended October 26, 2014.

While we believe that we have adequately provided for all uncertain tax positions, or tax positions where it is believed not more-likely-than-not that the position will be sustained upon examination, amounts asserted by tax authorities could be greater or less than our accrued position. Accordingly, our provisions on federal, state and foreign tax related matters to be recorded in the future may change as revised estimates are made or the underlying matters are settled or otherwise resolved with the respective tax authorities. As of October 26, 2014, we do not believe that our estimates, as otherwise provided for, on such tax positions will significantly increase or decrease within the next twelve months.