| Cover Page | Oct. 16, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Oct. 16, 2019 |
| Entity Registrant Name | INTERNATIONAL SPEEDWAY CORPORATION |
| Entity Incorporation, State or Country Code | FL |
| Entity File Number | 000-02384 |
| Entity Tax Identification Number | 59-0709342 |
| Entity Address, Address Line One | One Daytona Boulevard, |
| Entity Address, City or Town | Daytona Beach, |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 32114 |
| City Area Code | 386 |
| Local Phone Number | 254-2700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock - $.01 par value |
| Trading Symbol | ISCA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000051548 |
| Amendment Flag | false |
