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Acquisitions and Divestitures (Details) - USD ($) $ in Millions |  |  |  |  | 4 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Jan. 01, 2017 | Sep. 17, 2015 | Jul. 28, 2014 | Nov. 29, 2014 | May 30, 2015 | Jun. 03, 2017 | May 28, 2016 | May 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 2.0 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 303.1 | $ 304.5 | $ 305.3 | $ 303.1
Purchase of noncontrolling interests |  |  |  |  |  |  | $ (1.5) | 0.0 | (5.8)
Nelson Bubble Lamp Product Line [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  |  | $ 3.6 |  |  |  |  |  |
Contingent consideration |  |  | 2.7 |  |  |  |  |  |
Acquisition Of Design Within Reach (DWR) [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  | $ 155.2 |  | 155.2 |  |  |
Goodwill |  |  |  | $ 75.6 |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 81.00% |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Percent |  |  |  |  | 4.00% |  |  |  |
Purchase of noncontrolling interests |  |  |  |  | $ 5.8 |  |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  | 2.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | $ 68.5 |  |  |  |  |
Herman Miller Consumer Holdings Inc | Acquisition Of Design Within Reach (DWR) [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Capital Contributed Percentage of Acquiree |  |  |  | 15.00% |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 7.00% |  |  |  |  |
Noncontrolling Interest, Put Option Purchase Period from Date of Issuance |  |  |  | 5 years |  |  |  |  |
Contract-Based Intangible Assets | Nelson Bubble Lamp Product Line [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 2.5 |  |  |  |  |  |
Useful Life |  |  | 10 years |  |  |  |  |  |
Customer Relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Useful Life |  |  |  |  |  |  | 9 years |  |
Customer Relationships | Nelson Bubble Lamp Product Line [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 0.6 |  |  |  |  |  |
Useful Life |  |  | 10 years |  |  |  |  |  |
Customer Relationships | Acquisition Of Design Within Reach (DWR) [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 12.0 |  |  |  |  |
Consumer |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 75.6 | $ 78.8 | $ 78.8 | $ 75.6
Consumer | Nelson Bubble Lamp Product Line [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 3.2 |  |  |  |  |  |
PENNSYLVANIA | Wholly-owned contract furniture dealership |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 3.0 |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  | (0.7) |  |
Accounts and Notes Receivable, Net |  |  |  |  |  |  | $ 1.4 |  |

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