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Revenue from Contracts with Customers - Differences Due to Adoption Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 01, 2018 | Sep. 02, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | $ 624.6 | $ 580.3
Cost of sales | 399.5 | 363.4
Gross margin | 225.1 | 216.9
Total operating expenses | 179.1 | 167.4
Operating Earnings (Loss): | 46.0 | 49.5
Income tax expense | 8.9 | 14.2
Net earnings | 35.9 | 33.1
Net income attributable to Herman Miller, Inc. | 35.8 | $ 33.1
Performance Obligation Change | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | (10.7) |
Cost of sales | (5.8) |
Gross margin | (4.9) |
Total operating expenses | (0.1) |
Operating Earnings (Loss): | (4.8) |
Income tax expense | (1.1) |
Net income attributable to Herman Miller, Inc. | (3.7) |
Gross vs. Net Change | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | (8.5) |
Cost of sales | (8.5) |
Legacy GAAP |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 605.4 |
Cost of sales | 385.2 |
Gross margin | 220.2 |
Total operating expenses | 179.0 |
Operating Earnings (Loss): | 41.2 |
Income tax expense | 7.8 |
Net income attributable to Herman Miller, Inc. | $ 32.2 |

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