Comprehensive Income (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Nov. 30, 2015
Statement of Comprehensive Income [Abstract]
Terminated interest rate swap, net of tax benefit of $2,176 and $2,070, respectively	$ 3,158	$ 3,323
Accumulated other comprehensive income (loss), terminated interest rate swap, tax	$ 2,070	$ 2,176

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