Income Taxes	6 Months Ended
Jul. 27, 2014
Notes to financial statements [Abstract]
Income Taxes	Income Taxes We recognized income tax expense of $26.6 million and $53.4 million for the three and six months ended July 27, 2014, respectively, and $15.4 million and $25.5 million for the three and six months ended July 28, 2013, respectively. Income tax expense as a percentage of income before taxes, or our effective tax rate, was 17.2% and 16.8% for the three and six months ended July 27, 2014, respectively, and 13.8% and 12.8% for the three and six months ended July 28, 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 six months ended July 27, 2014. Our effective tax rate on income before tax for the first six months of fiscal year 2015 of 16.8% 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 six months of fiscal year 2015 of 16.8% differs from our annual projected effective tax rate as of the first six months of fiscal year 2015 of 19.1% due to favorable discrete events that occurred in the first six 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 six months of fiscal year 2014 of 12.8% 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 six months ended July 27, 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 from our 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 six months ended July 27, 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 July 27, 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 $26.6 million and $53.4 million for the three and six months ended July 27, 2014, respectively, and $15.4 million and $25.5 million for the three and six months ended July 28, 2013, respectively. Income tax expense as a percentage of income before taxes, or our effective tax rate, was 17.2% and 16.8% for the three and six months ended July 27, 2014, respectively, and 13.8% and 12.8% for the three and six months ended July 28, 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 six months ended July 27, 2014.

Our effective tax rate on income before tax for the first six months of fiscal year 2015 of 16.8% 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 six months of fiscal year 2015 of 16.8% differs from our annual projected effective tax rate as of the first six months of fiscal year 2015 of 19.1% due to favorable discrete events that occurred in the first six 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 six months of fiscal year 2014 of 12.8% 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 six months ended July 27, 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 from our 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 six months ended July 27, 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 July 27, 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.