Income Taxes	3 Months Ended
Feb. 28, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the three months ended February 28, 2015 and 2014, the Company recorded a tax provision of $59.7 million and $45.9 million, respectively, primarily related to pre-tax earnings. The effective tax rates for the three months ended February 28, 2015 and 2014 were 34.19% and 37.02%, respectively. The effective tax rates for both periods included a tax benefit for the domestic production activities deduction and energy tax credits, offset primarily by state income tax expense and interest accrued on uncertain tax positions. As of February 28, 2015 and November 30, 2014, the Company's deferred tax assets, net included in the condensed consolidated balance sheets were $286.1 million and $313.8 million, respectively. A reduction of the carrying amounts of deferred tax assets by a valuation allowance is required if, based on the available evidence, it is more likely than not that such assets will not be realized. Accordingly, the need to establish valuation allowances for deferred tax assets is assessed each reporting period by the Company based on the consideration of all available positive and negative evidence using a “more-likely-than-not” standard with respect to whether deferred tax assets will be realized. This assessment considers, among other matters, the nature, frequency and severity of current and cumulative losses, actual earnings, forecasts of future profitability, the duration of statutory carryforward periods, the Company’s experience with loss carryforwards not expiring unused and tax planning alternatives. As of both February 28, 2015 and November 30, 2014, the net deferred tax assets included a valuation allowance of $8.0 million, primarily related to state net operating loss (“NOL”) carryforwards that are not more likely than not to be utilized due to an inability to carry back these losses in most states and short carryforward periods that exist in certain states. At both February 28, 2015 and November 30, 2014, the Company had federal tax effected NOL carryforwards totaling $2.0 million that may be carried forward up to 20 years to offset future taxable income and begin to expire in 2029. At February 28, 2015 and November 30, 2014, the Company had state tax effected NOL carryforwards totaling $111.0 million and $113.8 million, respectively, that may be carried forward from 5 to 20 years, depending on the tax jurisdiction, with losses expiring between 2015 and 2034. At both February 28, 2015 and November 30, 2014, the Company had $7.3 million of gross unrecognized tax benefits. At February 28, 2015, the Company had $31.9 million accrued for interest and penalties, of which $0.4 million was recorded during the three months ended February 28, 2015. At November 30, 2014, the Company had $31.5 million accrued for interest and penalties.

Income Taxes

During the three months ended February 28, 2015 and 2014, the Company recorded a tax provision of $59.7 million and $45.9 million, respectively, primarily related to pre-tax earnings. The effective tax rates for the three months ended February 28, 2015 and 2014 were 34.19% and 37.02%, respectively. The effective tax rates for both periods included a tax benefit for the domestic production activities deduction and energy tax credits, offset primarily by state income tax expense and interest accrued on uncertain tax positions.

As of February 28, 2015 and November 30, 2014, the Company's deferred tax assets, net included in the condensed consolidated balance sheets were $286.1 million and $313.8 million, respectively.

A reduction of the carrying amounts of deferred tax assets by a valuation allowance is required if, based on the available evidence, it is more likely than not that such assets will not be realized. Accordingly, the need to establish valuation allowances for deferred tax assets is assessed each reporting period by the Company based on the consideration of all available positive and negative evidence using a “more-likely-than-not” standard with respect to whether deferred tax assets will be realized. This assessment considers, among other matters, the nature, frequency and severity of current and cumulative losses, actual earnings, forecasts of future profitability, the duration of statutory carryforward periods, the Company’s experience with loss carryforwards not expiring unused and tax planning alternatives.

As of both February 28, 2015 and November 30, 2014, the net deferred tax assets included a valuation allowance of $8.0 million, primarily related to state net operating loss (“NOL”) carryforwards that are not more likely than not to be utilized due to an inability to carry back these losses in most states and short carryforward periods that exist in certain states.

At both February 28, 2015 and November 30, 2014, the Company had federal tax effected NOL carryforwards totaling $2.0 million that may be carried forward up to 20 years to offset future taxable income and begin to expire in 2029. At February 28, 2015 and November 30, 2014, the Company had state tax effected NOL carryforwards totaling $111.0 million and $113.8 million, respectively, that may be carried forward from 5 to 20 years, depending on the tax jurisdiction, with losses expiring between 2015 and 2034.

At both February 28, 2015 and November 30, 2014, the Company had $7.3 million of gross unrecognized tax benefits. At February 28, 2015, the Company had $31.9 million accrued for interest and penalties, of which $0.4 million was recorded during the three months ended February 28, 2015. At November 30, 2014, the Company had $31.5 million accrued for interest and penalties.