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LONG-TERM DEBT - Non-printing Section (Details)
Nov. 30, 2014
Nov. 30, 2013
4.63 percent Senior Notes    
Debt Instrument [Line Items]    
Debt, interest rate 4.63%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_SeniorNotes46PercentDueJanuary2021Member		 4.63%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_SeniorNotes46PercentDueJanuary2021Member
3.95 percent Senior Notes    
Debt Instrument [Line Items]    
Debt, interest rate 3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_A395SeniorNotesMember		 3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_A395SeniorNotesMember
4.82 percent Revenue Bonds    
Debt Instrument [Line Items]    
Debt, interest rate 4.82%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_RevenueBonds48PercentMember		 4.82%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_RevenueBonds48PercentMember
6.25 percent Term Loan    
Debt Instrument [Line Items]    
Debt, interest rate 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_TermLoan63PercentDueOctober2034Member		 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isca_TermLoan63PercentDueOctober2034Member