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Derivatives (Details)
 12 Months Ended 12 Months Ended 12 Months Ended
Nov. 30, 2014
USD ($)
Nov. 30, 2013
USD ($)
Nov. 30, 2012
USD ($)
Nov. 30, 2014
Interest Rate Swap [Member]
USD ($)
Nov. 30, 2013
Interest Rate Swap [Member]
USD ($)
Nov. 30, 2012
Interest Rate Swap [Member]
USD ($)
Nov. 30, 2014
Forward-starting interest rate swap [Member]
USD ($)
Nov. 30, 2014
Foreign currency forward cash flow hedge [Member]
USD ($)
Nov. 30, 2013
Foreign currency forward cash flow hedge [Member]
USD ($)
Nov. 30, 2012
Foreign currency forward cash flow hedge [Member]
USD ($)
Nov. 30, 2014
Foreign currency forward contract to buy USD with CAD [Member]
USD ($)
Nov. 30, 2013
Foreign currency forward contract to buy USD with CAD [Member]
USD ($)
Nov. 30, 2014
Foreign currency forward contract to buy CAD with GBP [Member]
CAD
Nov. 30, 2013
Foreign currency forward contract to buy CAD with GBP [Member]
CAD
Nov. 30, 2014
Foreign currency forward contract to buy USD with EUR [Member]
USD ($)
Nov. 30, 2013
Foreign currency forward contract to buy USD with EUR [Member]
USD ($)
Nov. 30, 2014
Foreign currency forward contract to buy CHF with USD [Member]
CHF
Nov. 30, 2013
Foreign currency forward contract to buy CHF with USD [Member]
CHF
Nov. 30, 2014
Foreign currency forward contract to buy GBP with EUR [Member]
GBP (£)
Nov. 30, 2013
Foreign currency forward contract to buy GBP with EUR [Member]
GBP (£)
Nov. 30, 2014
Foreign currency forward contract to buy USD with GBP [Member]
USD ($)
Nov. 30, 2013
Foreign currency forward contract to buy USD with GBP [Member]
USD ($)
Nov. 30, 2014
Foreign currency forward contract to buy USD with JPY [Member]
USD ($)
Nov. 30, 2013
Foreign currency forward contract to buy USD with JPY [Member]
USD ($)
Nov. 30, 2014
Foreign currency forward contract to buy USD with KRW [Member]
USD ($)
Nov. 30, 2013
Foreign currency forward contract to buy USD with KRW [Member]
USD ($)
Nov. 30, 2014
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
USD ($)
Nov. 30, 2013
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
USD ($)
Nov. 30, 2012
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
USD ($)
Nov. 30, 2011
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
USD ($)
Derivatives, Fair Value [Line Items]                                                            
Derivative, Notional Amount       $ 100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		     $ 400,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForwardstartinginterestrateswapMember		 $ 11,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcashflowhedgeMember		 $ 15,900,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcashflowhedgeMember		   $ 51,194,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithCADMember		 $ 142,606,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithCADMember		 50,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyCADwithGBPMember		 28,741,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyCADwithGBPMember		 $ 12,517,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithEURMember		 $ 17,522,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithEURMember		 9,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyCHFwithUSDMember		 14,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyCHFwithUSDMember		 £ 4,774,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyGBPwithEURMember		 £ 5,866,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyGBPwithEURMember		 $ 48,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithGBPMember		 $ 3,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithGBPMember		 $ 8,778,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithJPYMember		 $ 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithJPYMember		 $ 10,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithKRWMember		 $ 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcontracttobuyUSDwithKRWMember		        
Derivative, Average Fixed Interest Rate       1.80%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		     2.86%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForwardstartinginterestrateswapMember		                                              
Accumulated other comprehensive loss (106,725,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (56,961,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                                 (9,482,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (2,199,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (2,225,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (1,918,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Foreign Currency Cash Flow Hedge Asset at Fair Value 987,000us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue 8,000us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue                                                        
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value 1,005,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue 1,548,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue                                                        
(Gain) Loss on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (6,293,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments (5,372,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments 2,491,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments                                                      
Derivative Asset, Fair Value, Gross Asset 1,992,000us-gaap_DerivativeFairValueOfDerivativeAsset 1,556,000us-gaap_DerivativeFairValueOfDerivativeAsset                                                        
Interest Rate Cash Flow Hedge Liability at Fair Value 16,662,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue 3,366,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue                                                        
Foreign Currency Cash Flow Hedge Liability at Fair Value 0us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue 423,000us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue                                                        
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 475,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue 957,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue                                                        
Derivative Liability, Fair Value, Gross Liability 17,137,000us-gaap_DerivativeFairValueOfDerivativeLiability 4,746,000us-gaap_DerivativeFairValueOfDerivativeLiability                                                        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months       2,900,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		                                                    
Amount of loss reclassified from AOCI into income:       $ 950,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 935,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 816,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		   $ 110,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcashflowhedgeMember		 $ 41,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcashflowhedgeMember		 $ 0us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= ihs_ForeigncurrencyforwardcashflowhedgeMember		                                 $ 1,060,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 $ 976,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 $ 816,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember