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Acquisitions and Divestitures (Details) - USD ($)
 9 Months Ended 12 Months Ended
Dec. 02, 2019
Oct. 25, 2019
Aug. 31, 2018
Jun. 07, 2018
Jul. 31, 2017
Feb. 29, 2020
May 30, 2020
Jun. 01, 2019
Jun. 02, 2018
Business Acquisition [Line Items]                  
Payments to Acquire Intangible Assets             $ 0 $ 4,800,000 $ 0
Business Combination, Separately Recognized Transactions, Net Gains and Losses             $ 5,900,000    
Contingent Equity Purchase             33.00%    
Gain on consolidation of equity method investments             $ 36,200,000 0 0
Investments in nonconsolidated affiliates             12,200,000 89,000,000.0  
Goodwill, Purchase Accounting Adjustments             6,300,000    
Business Combinations, Changes in Deferred Tax Liabilities             900,000    
Business Combinations, Changes in Inventory Step-up             0    
Business Combinations, Changes in Backlog             (1,700,000)    
Business Combinations, Changes in Deferred Revenue             (200,000)    
Business Combinations, Changes in Tradename             4,000,000.0    
Business Combinations, Changes in Product Development             1,000,000.0    
Business Combinations, Changes in Customer Relationships             1,000,000.0    
Business Combinations, Measurement Period Adjustments             4,100,000    
Impairment charges             205,400,000 0 $ 0
Business Acquisition, Pro Forma Revenue             2,580,600,000 2,757,300,000  
Business Acquisition, Pro Forma Net Income (Loss)             (46,300,000) 163,700,000  
MAARS                  
Business Acquisition [Line Items]                  
Business Acquisition, Percentage of Voting Interests Acquired     48.20%            
Purchase Price     $ 6,100,000            
HAY                  
Business Acquisition [Line Items]                  
Business Acquisition, Percentage of Voting Interests Acquired 34.00%     33.00%          
Purchase Price $ 79,000,000.0     $ 65,500,000          
Payments to Acquire Intangible Assets       $ 4,800,000          
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 67.00%                
Goodwill, Acquired During Period             111,100,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 12,100,000                
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital 12,300,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 900,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 3,900,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other (3,100,000)                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 26,100,000                
Gain on consolidation of equity method investments             300,000    
Investments in nonconsolidated affiliates $ 67,800,000                
Deferred Tax Liabilities, Goodwill             26,200,000    
Finite and Indefinite-Lived Intangible Assets Aquired           $ 114,800,000 118,900,000    
naughtone                  
Business Acquisition [Line Items]                  
Business Acquisition, Percentage of Voting Interests Acquired   47.50%              
Purchase Price   $ 45,900,000              
Goodwill, Acquired During Period             57,500,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   5,100,000              
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital   1,300,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   800,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   7,200,000              
Gain on consolidation of equity method investments             30,000,000.0    
Investments in nonconsolidated affiliates   20,500,000              
Finite and Indefinite-Lived Intangible Assets Aquired   $ 38,900,000              
Wholly-owned contract furniture dealership | CANADA                  
Business Acquisition [Line Items]                  
Proceeds from Divestiture of Businesses         $ 2,000,000.0        
Gain (Loss) on Disposition of Business               $ 1,100,000  
Fair Value Adjustment to Inventory [Member] | HAY                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 24 days                
Finite-lived Intangible Assets Acquired           (3,400,000) (3,400,000)    
Fair Value Adjustment to Inventory [Member] | naughtone                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   3 months 18 days              
Finite-lived Intangible Assets Acquired   $ (200,000)              
Order or Production Backlog [Member] | HAY                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 months 18 days                
Finite-lived Intangible Assets Acquired           (3,400,000) (1,700,000)    
Order or Production Backlog [Member] | naughtone                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   3 months 18 days              
Finite-lived Intangible Assets Acquired   $ (800,000)              
DeferredRevenueIntangible [Member] | HAY                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 days                
Finite-lived Intangible Assets Acquired           (2,000,000.0) (2,200,000)    
Technology-Based Intangible Assets [Member] | HAY                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 8 years                
Finite-lived Intangible Assets Acquired           (21,000,000.0) (22,000,000.0)    
Customer Relationships | HAY                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years                
Finite-lived Intangible Assets Acquired           (33,000,000.0) (34,000,000.0)    
Customer Relationships | naughtone                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   9 years              
Finite-lived Intangible Assets Acquired   $ (29,400,000)              
Trade Names | HAY                  
Business Acquisition [Line Items]                  
Indefinite-lived Intangible Assets Acquired           56,000,000.0 60,000,000.0    
Trade Names | naughtone                  
Business Acquisition [Line Items]                  
Indefinite-lived Intangible Assets Acquired   $ 8,500,000              
North America Contract | naughtone                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period             35,000,000.0    
International Contract | HAY                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period             101,100,000    
International Contract | naughtone                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period           $ 22,500,000      
Retail | HAY                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period             $ 10,000,000.0