Income Taxes	6 Months Ended
Apr. 28, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three and six months ended April 28, 2012, the Company recorded an income tax benefit of $0.7 million and $3.9 million, respectively, primarily due to a discrete benefit from net reserve releases of settling the federal research and development tax credit for fiscal years 2009 and 2010 with the Internal Revenue Service ("IRS"), closing the IRS audits for fiscal years 2004 through 2006, settling Foundry's 2006 and 2007 California franchise tax audit, and releases from expiring statutes of limitations, offset by a decrease to the federal research and development tax credit which expired on December 31, 2011. For the three and six months ended April 30, 2011, the Company recorded an income tax benefit of $0.6 million and $6.3 million, respectively, primarily due to a discrete benefit from the retroactive reinstatement of the federal research and development tax credit for calendar year 2011, as a result of the Tax Relief Act enacted on December 17, 2010, and reserve releases from the settlement of certain issues with the IRS regarding the Company's fiscal years 2007 and 2008 audits. The total amount of unrecognized tax benefits of $105.0 million as of April 28, 2012 would affect the Company’s effective tax rate, if recognized. Although the timing of the closure of audits is highly uncertain, it is reasonably possible that the balance of unrecognized tax benefits could significantly change during fiscal year 2012. The IRS and other tax authorities regularly examine the Company's income tax returns. The IRS is currently examining fiscal years 2009 and 2010. In addition, the Company is under negotiations with the Appeals division of the IRS on transfer pricing issues for fiscal years 2007 and 2008, and in discussion with foreign tax authorities to obtain correlative relief on transfer pricing adjustments settled with the IRS. We believe that our reserves for unrecognized tax benefits are adequate for all open tax years. The timing of the resolution of income tax examinations, as well as the amounts and timing of related settlements, is highly uncertain. The Company believes that before the end of fiscal year 2012, it is reasonably possible that either certain audits will conclude or the statutes of limitations relating to certain income tax examination periods will expire, or both. As such, after we reach settlement with the tax authorities, we expect to record a corresponding adjustment to our unrecognized tax benefits. Given the uncertainty as to settlement terms, the timing of payments and the impact of such settlements on other uncertain tax positions, the range of estimated potential decreases in underlying uncertain tax positions is between $0 and $10 million in the next twelve months. The Company believes that sufficient positive evidence exists from historical operations and projections of taxable income in future years to conclude that it is more likely than not that the Company will realize its deferred tax assets. Accordingly, the Company applies a valuation allowance only on the deferred tax assets relating to capital loss carryforwards, due to limited carryforward periods and the character of such tax attributes. The Governor of the State of California and the California state legislature have introduced tax proposals affecting future state income tax apportionment that may have a significant impact on our ability to realize certain California deferred tax assets. We will reevaluate the realization of these California deferred tax assets if and when the current law changes.

Income Taxes

For the three and six months ended April 28, 2012, the Company recorded an income tax benefit of $0.7 million and $3.9 million, respectively, primarily due to a discrete benefit from net reserve releases of settling the federal research and development tax credit for fiscal years 2009 and 2010 with the Internal Revenue Service ("IRS"), closing the IRS audits for fiscal years 2004 through 2006, settling Foundry's 2006 and 2007 California franchise tax audit, and releases from expiring statutes of limitations, offset by a decrease to the federal research and development tax credit which expired on December 31, 2011.

For the three and six months ended April 30, 2011, the Company recorded an income tax benefit of $0.6 million and $6.3 million, respectively, primarily due to a discrete benefit from the retroactive reinstatement of the federal research and development tax credit for calendar year 2011, as a result of the Tax Relief Act enacted on December 17, 2010, and reserve releases from the settlement of certain issues with the IRS regarding the Company's fiscal years 2007 and 2008 audits.

The total amount of unrecognized tax benefits of $105.0 million as of April 28, 2012 would affect the Company’s effective tax rate, if recognized. Although the timing of the closure of audits is highly uncertain, it is reasonably possible that the balance of unrecognized tax benefits could significantly change during fiscal year 2012.

The IRS and other tax authorities regularly examine the Company's income tax returns. The IRS is currently examining fiscal years 2009 and 2010. In addition, the Company is under negotiations with the Appeals division of the IRS on transfer pricing issues for fiscal years 2007 and 2008, and in discussion with foreign tax authorities to obtain correlative relief on transfer pricing adjustments settled with the IRS. We believe that our reserves for unrecognized tax benefits are adequate for all open tax years. The timing of the resolution of income tax examinations, as well as the amounts and timing of related settlements, is highly uncertain. The Company believes that before the end of fiscal year 2012, it is reasonably possible that either certain audits will conclude or the statutes of limitations relating to certain income tax examination periods will expire, or both. As such, after we reach settlement with the tax authorities, we expect to record a corresponding adjustment to our unrecognized tax benefits. Given the uncertainty as to settlement terms, the timing of payments and the impact of such settlements on other uncertain tax positions, the range of estimated potential decreases in underlying uncertain tax positions is between $0 and $10 million in the next twelve months.

The Company believes that sufficient positive evidence exists from historical operations and projections of taxable income in future years to conclude that it is more likely than not that the Company will realize its deferred tax assets. Accordingly, the Company applies a valuation allowance only on the deferred tax assets relating to capital loss carryforwards, due to limited carryforward periods and the character of such tax attributes. The Governor of the State of California and the California state legislature have introduced tax proposals affecting future state income tax apportionment that may have a significant impact on our ability to realize certain California deferred tax assets. We will reevaluate the realization of these California deferred tax assets if and when the current law changes.