Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Sep. 28, 2019	Dec. 28, 2019		Dec. 29, 2018		Dec. 30, 2017
Goodwill [Line Items]
Impairment of goodwill and intangible assets		$ (19.7)		$ (40.0)	[1]	$ 0.0	[1]	$ (62.9)	[1]
Goodwill, Impairment Loss				17.5		0.0
Intangible Assets, Net (Excluding Goodwill)	$ 24.6			$ 24.6		52.9
Goodwill, Impaired, Method for Fair Value Determination			The fair value analysis for Fuller Mexico was completed using the income approach, which was considered a Level 3 measurement within the fair value hierarchy. The significant assumptions used in the income approach included estimates regarding future operations and the ability to generate cash flows, including projections of revenue, costs, utilization of assets and capital requirements. The income approach, or discounted cash flow approach, also requires an estimate as to the appropriate discount rate to be used. The most sensitive estimate in this valuation is the projection of operating cash flows, as these provide the basis for the estimate of fair market value. The Company’s cash flow model used a forecast period of ten years with annual revenue growth rates ranging from negative eight percent to positive four percent, a compound average growth rate of 0.2 percent, and a 2.5 percent growth rate used in calculating the terminal value. The discount rate used was 14.9 percent. The growth rates were determined by reviewing historical results of the operating unit and the historical results of the Company’s other similar business units, along with the expected contribution from growth strategies being implemented.
Percentage Change in Margin, Fuller Products	(30.00%)			(30.00%)
Goodwill, Gross	$ 244.6			$ 244.6		243.7		246.5
Goodwill, Foreign Currency Translation Gain (Loss)				0.9		(2.8)
Goodwill, Impaired, Accumulated Impairment Loss	185.1			185.1		167.6		167.6
Fuller Mexico [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		17.5
Impairment of Long-Lived Assets Held-for-use		0.0
South America
Goodwill [Line Items]
Goodwill, Impairment Loss				0.0		0.0
Goodwill, Gross	2.8			2.8		3.1		3.6
Goodwill, Foreign Currency Translation Gain (Loss)				(0.3)		(0.5)
Goodwill, Impaired, Accumulated Impairment Loss	0.0			0.0		0.0		0.0
Europe
Goodwill [Line Items]
Goodwill, Impairment Loss				0.0		0.0
Goodwill, Gross	29.3			29.3		29.2		29.9
Goodwill, Foreign Currency Translation Gain (Loss)				0.1		(0.7)
Goodwill, Impaired, Accumulated Impairment Loss	24.5			24.5		24.5		24.5
Asia Pacific
Goodwill [Line Items]
Goodwill, Impairment Loss				0.0		0.0
Goodwill, Gross	77.1			77.1		77.0		78.1
Goodwill, Foreign Currency Translation Gain (Loss)				0.1		(1.1)
Goodwill, Impaired, Accumulated Impairment Loss	41.3			41.3		41.3		41.3
North America
Goodwill [Line Items]
Goodwill, Impairment Loss				17.5		0.0
Goodwill, Gross	135.4			135.4		134.4		134.9
Goodwill, Foreign Currency Translation Gain (Loss)				1.0		(0.5)
Goodwill, Impaired, Accumulated Impairment Loss	119.3			119.3		101.8		$ 101.8
Trademarks and Trade Names [Member]
Goodwill [Line Items]
Impairment of goodwill and intangible assets				(22.5)		$ 0.0
Nutrimetics [Member] | Trademarks and Trade Names [Member]
Goodwill [Line Items]
Impairment of goodwill and intangible assets		(2.2)
Intangible Assets, Net (Excluding Goodwill)		$ 3.5	$ 3.5
Fuller [Member] | Trademarks and Trade Names [Member]
Goodwill [Line Items]
Impairment of goodwill and intangible assets	(20.3)
Intangible Assets, Net (Excluding Goodwill)	6.5			$ 6.5
Fuller [Member] | Trademarks and Trade Names [Member] | South America
Goodwill [Line Items]
Impairment of goodwill and intangible assets	(0.7)
Fuller [Member] | Trademarks and Trade Names [Member] | Asia Pacific
Goodwill [Line Items]
Impairment of goodwill and intangible assets	(6.0)
Fuller [Member] | Trademarks and Trade Names [Member] | North America
Goodwill [Line Items]
Impairment of goodwill and intangible assets	$ (13.6)

[1] See Note 7 for discussion of goodwill impairment charges.