Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 26, 2020
Goodwill [Line Items]
Goodwill impairment losses	$ 0	$ 0		$ 21,607,000
Impairment of definite-lived intangible assets	0	0
Impairment of indefinite-lived intangible assets	$ 0	$ 0
Workplace furnishings
Goodwill [Line Items]
Goodwill impairment losses				$ 21,607,000
Trademarks and trade names | Workplace furnishings
Goodwill [Line Items]
Impairment of definite-lived intangible assets			$ 600,000
Customer lists and other | Workplace furnishings
Goodwill [Line Items]
Impairment of definite-lived intangible assets			8,200,000
Trade Names | Workplace furnishings
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets			2,300,000
Reporting Unit One | Workplace furnishings
Goodwill [Line Items]
Goodwill impairment losses			14,100,000
Reporting Unit Two | Workplace furnishings
Goodwill [Line Items]
Goodwill impairment losses			$ 7,500,000