| Document And Entity Information | Jun. 26, 2019 |
| Document Information [Line Items] | |
| EntityRegistrantName | FULLER H B CO |
| DocumentType | 8-K |
| DocumentPeriodEndDate | Jun. 26, 2019 |
| EntityIncorporationStateCountryCode | MN |
| EntityFileNumber | 001-09225 |
| EntityTaxIdentificationNumber | 41-0268370 |
| EntityAddressAddressLine1 | 1200 Willow Lake Boulevard, P.O. Box 64683 |
| EntityAddressCityOrTown | St. Paul |
| EntityAddressStateOrProvince | MN |
| EntityAddressPostalZipCode | 55164-0683 |
| CityAreaCode | 651 |
| LocalPhoneNumber | 236-5900 |
| Security12bTitle | Common Stock |
| TradingSymbol | FUL |
| SecurityExchangeName | NYSE |
| WrittenCommunications | false |
| SolicitingMaterial | false |
| PreCommencementTenderOffer | false |
| PreCommencementIssuerTenderOffer | false |
| AmendmentFlag | false |
| EntityCentralIndexKey | 0000039368 |
| EntityEmergingGrowthCompany | false |
