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Revenue from Contracts with Customers - Revenue Disaggregated By Product Type And Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 28, 2021	Aug. 29, 2020
Disaggregation of Revenue [Line Items]
Net Sales:	$ 789.7	$ 626.8
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Net Sales:	(3.6)	0.0
Americas Contract: | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	325.3	370.1
Americas Contract: | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	176.4	213.7
Americas Contract: | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	84.9	86.7
Americas Contract: | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	32.7	32.8
Americas Contract: | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	31.3	36.9
International Contract: | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	99.0	94.0
International Contract: | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	25.7	31.7
International Contract: | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	49.2	43.7
International Contract: | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	22.5	17.8
International Contract: | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	1.6	0.8
Retail: | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	212.6	162.7
Retail: | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	3.5	2.3
Retail: | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	61.1	57.6
Retail: | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	147.6	103.0
Retail: | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	0.4	(0.2)
Knoll | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	156.4	0.0
Knoll | Workplace | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	75.2	0.0
Knoll | Performance Seating | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	12.1	0.0
Knoll | Lifestyle | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	56.4	0.0
Knoll | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Net Sales:	$ 12.7	$ 0.0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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