Document and Entity Information - USD ($)	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2017	May 31, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Nov. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	ISCA
Entity Registrant Name	INTERNATIONAL SPEEDWAY CORP
Entity Central Index Key	0000051548
Current Fiscal Year End Date	--11-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 915,487,926.10
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		24,499,629
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		19,690,287