Document And Entity Information - USD ($)	12 Months Ended
	Nov. 28, 2020	Jan. 21, 2021	May 29, 2020
Document Information [Line Items]
Entity Central Index Key	0000039368
Entity Registrant Name	FULLER H B CO
Amendment Flag	true
Current Fiscal Year End Date	--11-27
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Nov. 28, 2020
Document Transition Report	false
Entity File Number	001-09225
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	41-0268370
Entity Address, Address Line One	1200 Willow Lake Boulevard
Entity Address, City or Town	St. Paul
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55110-5101
City Area Code	651
Local Phone Number	236-5900
Title of 12(b) Security	Common Stock, par value $1.00
Trading Symbol	FUL
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,924,019,850
Entity Common Stock, Shares Outstanding		51,969,463
ICFR Auditor Attestation Flag	true
Amendment Description	This Amendment No. 1 on Form 10-K/A (the “Amendment”) amends the Annual Report on Form 10-K of H.B. Fuller Company (the “Company”) for the fiscal year ended November 28, 2020, as originally filed with the Securities and Exchange Commission on January 26, 2021 (the “Original Form 10-K”). The Company is filing this Amendment to include a reissued audit report on the 2019 and 2018 financial statements of its predecessor independent auditor, KPMG LLP. The reissued audit report was dual dated to indicate that KPMG LLP has audited and reported on the adjustments made to the 2019 and 2018 segment financial information that was recast to retrospectively reflect the realignment of the Company's operating segment structure as further described in Note 15 to the consolidated financial statements.   No other changes were made to the Original Form 10-K except for removing the paragraph and table containing adjusted EBITDA information by segment in Note 15. Except as stated herein, this Amendment does not reflect events occurring after the date of the Original Form 10-K, nor does it modify or update any of the financial or other disclosures as presented in the Original Form 10-K. Information not affected by this Amendment remains unchanged and reflects the disclosures made at the time the Original Form 10-K was filed.   As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by the Company’s principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV. In addition, new consents of Ernst & Young LLP and KPMG LLP have been included in Item 15 of Part IV, Exhibits 23.1 and 23.2.