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FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
Nov. 30, 2014
Fair Value, Inputs, Level 1  
Fair Value, Measurement Inputs, Disclosure [Line Items]  
Money market funds $ 62.6isca_MoneyMarketFundsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2  
Fair Value, Measurement Inputs, Disclosure [Line Items]  
Long-term debt excluding credit facilities, fair value 291.2isca_LongTermDebtExcludingCreditFacilitiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Long-term debt excluding credit facilities, carrying amount $ 271.7isca_LongTermDebtExcludingCreditFacilitiesCarryingAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member