Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2014	Nov. 30, 2013
Statement of Comprehensive Income [Abstract]
Terminated interest rate swap, net of tax benefit of $3,448 and $3,130, respectively	$ 4,310	$ 4,638
Accumulated other comprehensive income (loss), terminated interest rate swap, tax	$ 2,812	$ 3,025

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