Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2013	Nov. 30, 2012
Comprehensive Income [Abstract]
Terminated interest rate swap, net of tax benefit of $3,448 and $3,236, respectively	$ 4,967	$ 5,296
Accumulated other comprehensive income (loss), terminated interest rate swap, tax	$ 3,236	$ 3,448

Accumulated Other Comprehensive Income (Loss), Terminated Interest Rate Swap, Net of Tax

No definition available.

Name:	isca_AccumulatedOtherComprehensiveIncomeLossTerminatedInterestRateSwapNetOfTax
Namespace Prefix:	isca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant