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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Grantor Stock Ownership Trust
Treasury Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Balance at Nov. 30, 2011 $ 442,657us-gaap_StockholdersEquity $ 115,171us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (118,059)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
$ (932,337)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 884,190us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 519,844us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (26,152)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning Balance, Shares at Nov. 30, 2011   (115,171,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(10,884,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(27,214,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Net income (loss) (58,953)us-gaap_NetIncomeLoss         (58,953)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Dividends on common stock (10,599)us-gaap_DividendsCommonStockCash         (10,599)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Employee stock options/other, Shares (7,494)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (7,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Employee stock options/other, Value 104us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 7us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    97us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Restricted stock awards, Shares     208,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
       
Restricted stock awards, Value 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures   (2,253)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  (2,253)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Stock-based compensation 6,713us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       6,713us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Grantor stock ownership trust, Shares     60,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
       
Grantor stock ownership trust, Value (489)us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan   (657)us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  (168)us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Treasury stock, Shares       (126,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Treasury stock, Value (1,799)us-gaap_TreasuryStockValueAcquiredCostMethod     (1,799)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Balance at Nov. 30, 2012 376,806us-gaap_StockholdersEquity 115,178us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(115,149)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(934,136)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
888,579us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
450,292us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(27,958)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Other comprehensive income (loss), net of tax at Nov. 30, 2012 (1,806)us-gaap_OtherComprehensiveIncomeLossNetOfTax           (1,806)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, Shares at Nov. 30, 2012   (115,178,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(10,616,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(27,340,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Net income (loss) 39,963us-gaap_NetIncomeLoss         39,963us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Dividends on common stock (8,366)us-gaap_DividendsCommonStockCash         (8,366)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Employee stock options/other, Shares (118,208)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (118,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Employee stock options/other, Value 1,592us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 118us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    1,474us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Conversion of liability awards to equity awards, Shares       478,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Conversion of liability awards to equity awards, Value 8,346us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation     7,934us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
412us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Restricted stock awards, Shares     88,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
       
Restricted stock awards, Value 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures   (954)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  (954)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Stock-based compensation 5,699us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       5,699us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock, Shares       6,325,000us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Issuance of common stock, Value (109,503)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued     (216,125)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(106,622)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Grantor stock ownership trust, Shares     26,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
       
Grantor stock ownership trust, Value (589)us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan   (284)us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  (305)us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Treasury stock, Shares       (513,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Treasury stock, Value (8,488)us-gaap_TreasuryStockValueAcquiredCostMethod     (8,488)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Balance at Nov. 30, 2013 536,086us-gaap_StockholdersEquity 115,296us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(113,911)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(718,565)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
788,893us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
481,889us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(17,516)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Other comprehensive income (loss), net of tax at Nov. 30, 2013 10,442us-gaap_OtherComprehensiveIncomeLossNetOfTax           10,442us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, Shares at Nov. 30, 2013   (115,296,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(10,502,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(21,050,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Net income (loss) 918,349us-gaap_NetIncomeLoss         918,349us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Dividends on common stock (8,982)us-gaap_DividendsCommonStockCash         (8,982)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Employee stock options/other, Shares (36,665)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (37,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Employee stock options/other, Value 1,896us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 37us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    1,859us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Conversion of liability awards to equity awards, Shares   54,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Conversion of liability awards to equity awards, Value 6,455us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 54us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    6,455us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Restricted stock awards, Shares     166,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
       
Restricted stock awards, Value 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures   (1,805)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  (1,859)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Stock-based compensation 9,099us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       9,099us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Issuance of common stock, Shares       7,986,000us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Issuance of common stock, Value (137,045)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued     (272,635)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(135,590)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   
Treasury stock, Shares       (33,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Treasury stock, Value (546)us-gaap_TreasuryStockValueAcquiredCostMethod     (546)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Balance at Nov. 30, 2014 1,595,910us-gaap_StockholdersEquity 115,387us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(112,106)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(446,476)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
668,857us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
1,391,256us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(21,008)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Other comprehensive income (loss), net of tax at Nov. 30, 2014 $ (3,492)us-gaap_OtherComprehensiveIncomeLossNetOfTax           $ (3,492)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, Shares at Nov. 30, 2014   (115,387,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(10,336,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TrustForBenefitOfEmployeesMember
(13,097,000)us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember