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Consolidated Statements of Comprehensive Income Statement (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2014 | Aug. 31, 2014 | May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2012
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 852,801 us-gaap_NetIncomeLoss | $ 28,361 us-gaap_NetIncomeLoss | $ 26,624 us-gaap_NetIncomeLoss | $ 10,563 us-gaap_NetIncomeLoss | $ 28,116 us-gaap_NetIncomeLoss | $ 27,278 us-gaap_NetIncomeLoss | $ (2,973)us-gaap_NetIncomeLoss | $ (12,458)us-gaap_NetIncomeLoss | $ 918,349 us-gaap_NetIncomeLoss | $ 39,963 us-gaap_NetIncomeLoss | $ (58,953)us-gaap_NetIncomeLoss
Net actuarial gain (loss) arising during the period |  |  |  |  |  |  |  |  | (3,801)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | 7,083 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | (4,765)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Amortization of net actuarial loss |  |  |  |  |  |  |  |  | 357 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses | 1,803 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses | 1,403 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Amortization of prior service cost |  |  |  |  |  |  |  |  | 1,556 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax | 1,556 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax | 1,556 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Other comprehensive income (loss) before tax |  |  |  |  |  |  |  |  | (1,888)us-gaap_OtherComprehensiveIncomeLossBeforeTax | 10,442 us-gaap_OtherComprehensiveIncomeLossBeforeTax | (1,806)us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax expense related to items of other comprehensive income |  |  |  |  |  |  |  |  | (1,604)us-gaap_OtherComprehensiveIncomeLossTax | 0 us-gaap_OtherComprehensiveIncomeLossTax | 0 us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (3,492)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 10,442 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (1,806)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 914,857 us-gaap_ComprehensiveIncomeNetOfTax | $ 50,405 us-gaap_ComprehensiveIncomeNetOfTax | $ (60,759)us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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