Income Taxes	6 Months Ended
May. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our income tax provision for the second quarter of fiscal year 2015 and 2014 reflects our estimates of the effective tax rates expected to be applicable for the full fiscal years, adjusted for any discrete events which are recorded in the period they occur. The estimates are reevaluated each quarter based on our estimated tax expense for the full fiscal year. The research and development credit was retroactively reinstated in December 2014. As a result, in the first quarter of fiscal year 2015 we recorded a tax benefit of $0.8 million related to qualifying research and development activities for the period from January 2014 to November 2014. Our Federal income tax returns have been examined or are closed by statute for all years prior to fiscal year 2011, and we are no longer subject to audit for those periods. Our state income tax returns have been examined or are closed by statute for all years prior to fiscal year 2009, and we are no longer subject to audit for those periods.

Income Taxes

6 Months Ended

May. 31, 2015

Our income tax provision for the second quarter of fiscal year 2015 and 2014 reflects our estimates of the effective tax rates expected to be applicable for the full fiscal years, adjusted for any discrete events which are recorded in the period they occur. The estimates are reevaluated each quarter based on our estimated tax expense for the full fiscal year.

The research and development credit was retroactively reinstated in December 2014. As a result, in the first quarter of fiscal year 2015 we recorded a tax benefit of $0.8 million related to qualifying research and development activities for the period from January 2014 to November 2014.

Our Federal income tax returns have been examined or are closed by statute for all years prior to fiscal year 2011, and we are no longer subject to audit for those periods. Our state income tax returns have been examined or are closed by statute for all years prior to fiscal year 2009, and we are no longer subject to audit for those periods.