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Stock-Based Compensation (Tables) | 12 Months Ended
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May 28, 2016
Valuation and Qualifying Accounts Disclosure |
Schedule of Pre-Tax Compensation Expense and Related Tax Benefits | Pre-tax compensation expense and the related income tax benefit for all types of stock-based programs was as follows for the periods indicated:
(In millions) |  | May 28, 2016 |  | May 30, 2015 |  | May 31, 2014
Employee stock purchase program |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Stock option plans |  | 1.9 |  |  | 2.6 |  |  | 2.3 |
Restricted stock grants |  | — |  |  | 0.1 |  |  | 0.2 |
Restricted stock units |  | 3.2 |  |  | 3.7 |  |  | 5.2 |
Performance share units |  | 6.5 |  |  | 3.3 |  |  | 3.0 |
Total |  | $ | 11.9 |  |  | $ | 10.0 |  |  | $ | 11.0 |
Tax benefit |  | $ | 4.3 |  |  | $ | 3.6 |  |  | $ | 4.0 |
Schedule of Fair Value of Employee Stock Options | The company estimated the fair value of employee stock options on the date of grant using the Black-Scholes model. In determining these values, the following weighted-average assumptions were used for the options granted during the fiscal years indicated.
|  | 2016 |  | 2015 |  | 2014
Risk-free interest rates (1) |  | 1.51 | % |  | 1.46 | % |  | 1.62 | %
Expected term of options (2) |  | 4.0 years |  |  | 4.0 years |  |  | 5.5 years |
Expected volatility (3) |  | 33 | % |  | 36 | % |  | 46 | %
Dividend yield (4) |  | 2.03 | % |  | 1.85 | % |  | 1.74 | %
Weighted-average grant-date fair value of stock options: |  |  |  |  |  |
Granted with exercise prices equal to the fair market value of the stock on the date of grant |  | 6.73 |  |  | 7.74 |  |  | 10.68 |
(1) Represents the U.S. Treasury yield over the same period as the expected option term. (2) Represents the period of time that options granted are expected to be outstanding. Based on analysis of historical option exercise activity, the company has determined that all employee groups exhibit similar exercise and post-vesting termination behavior. (3) Amount is determined based on analysis of historical price volatility of the company's common stock over a period equal to the expected term of the options. (4) Represents the company's estimated cash dividend yield over the expected term of options.
Schedule of Stock Option Plan Transactions | The following is a summary of the transactions under the company's stock option plans:
|  | Shares Under Option |  | Weighted-Average Exercise Prices |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at May 30, 2015 |  | 1,302,623 |  |  | $ | 26.05 |  |  | 4.0 |  | $ | 4.7 |
Granted at market |  | 91,070 |  |  | $ | 29.03 |  |  |  |  |
Exercised |  | (288,470 | ) |  | $ | 23.15 |  |  |  |  |
Forfeited or expired |  | (183,843 | ) |  | $ | 33.33 |  |  |  |  |
Outstanding at May 28, 2016 |  | 921,380 |  |  | $ | 25.80 |  |  | 4.2 |  | 5.5 |
Ending vested + expected to vest |  | 921,380 |  |  | $ | 25.80 |  |  | 4.2 |  | $ | 5.5 |
Exercisable at end of period |  | 764,060 |  |  | $ | 25.06 |  |  | 3.3 |  | $ | 5.1 |
Schedule of Restricted Stock Grants | The company recognizes the related compensation expense on a straight-line basis over the requisite service period. A summary of shares subject to restrictions are as follows:
|  | 2016
|  | Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at May 30, 2015 |  | 50,323 |  |  | $ | 20.80 |
Granted |  | — |  |  | $ | — |
Vested |  | (28,500 | ) |  | $ | 20.37 |
Forfeited |  | (1,000 | ) |  | $ | 21.71 |
Outstanding at May 28, 2016 |  | 20,823 |  |  | $ | 21.35 |
Schedule of Restricted Stock Unit (RSU) Activity | The following is a summary of restricted stock unit transactions for the fiscal years indicated:
| Share Units |  | Weighted Average Grant-Date Fair Value |  | Aggregate Intrinsic Value in Millions |  | Weighted-Average Remaining Contractual Term (Years)
Outstanding at May 30, 2015 | 505,472 |  |  | $ | 24.21 |  |  | $ | 13.5 |  |  | 1.2
Granted | 110,176 |  |  | $ | 29.03 |  |  |  |  |
Forfeited | (17,321 | ) |  | $ | 27.09 |  |  |  |  |
Released | (220,466 | ) |  | $ | 19.97 |  |  |  |  |
Outstanding at May 28, 2016 | 377,861 |  |  | $ | 27.83 |  |  | $ | 12.0 |  |  | 1.4
Ending vested + expected to vest | 377,861 |  |  | 27.83 |  |  | $ | 10.8 |  |  | 1.4
Schedule of Performance-based Stock Units (PSU) Activity | The following is a summary of performance share unit transactions for the fiscal years indicated:
| Share Units |  | Weighted Average Grant-Date Fair Value |  | Aggregate Intrinsic Value in Millions |  | Weighted-Average Remaining Contractual Term (Years)
Outstanding at May 30, 2015 | 356,906 |  |  | $ | 29.17 |  |  | $ | 9.9 |  |  | 1.3
Granted | 154,621 |  |  | $ | 30.81 |  |  |  |  |
Forfeited | (21,988 | ) |  | $ | 20.64 |  |  |  |  |
Released | (55,825 | ) |  | $ | 17.10 |  |  |  |  |
Outstanding at May 28, 2016 | 433,714 |  |  | $ | 31.74 |  |  | $ | 13.7 |  |  | 1.2
Ending vested + expected to vest | 433,714 |  |  | $ | 31.74 |  |  | $ | 13.7 |  |  | 1.2
Schedule of Director Share Based Compensation | The exercise price of the stock options granted may not be less than the market price of the company's common stock on the date of grant. Under the plan, the Board members received the following shares or options in the fiscal years indicated:
|  | 2016 |  | 2015 |  | 2014
Shares of common stock |  | 21,988 |  |  | 13,752 |  |  | 12,358 |
Shares through the deferred compensation program |  | 3,118 |  |  | — |  |  | 2,317 |
Herman Miller Consumer Holdings Inc [Member] |
Valuation and Qualifying Accounts Disclosure |
Schedule of Fair Value of Employee Stock Options | The following weighted-average assumptions were used to value the liability associated with HMCH stock options as of May 28, 2016 and May 30, 2015.
|  | 2016 |  | 2015
Risk-free interest rates (1) |  | 1.07 | % |  | 0.99 | %
Expected term of options (2) |  | 3.1 years |  |  | 3.2 years |
Expected volatility (3) |  | 35 | % |  | 35 | %
Dividend yield |  | not applicable |  |  | not applicable |
Strike price |  | $ | 24.39 |  |  | 24.39 |
Per share value (4) |  | $ | 6.52 |  |  | 8.71 |
Schedule of Stock Option Plan Transactions |
|  | Shares Under Option |  | Weighted-Average Exercise Prices |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at May 30, 2015 |  | 504,669 |  |  | $ | 23.92 |  |  | 4.2 |  | $ | 2.1 |
Granted |  | — |  |  | $ | — |  |  |  |  |
Exercised |  | (4,293 | ) |  | $ | 6.12 |  |  |  |  |
Forfeited |  | — |  |  | $ | — |  |  |  |  |
Outstanding at May 28, 2016 |  | 500,376 |  |  | $ | 24.07 |  |  | 3.2 |  | $ | 0.4 |
Exercisable at end of period |  | 9,290 |  |  | $ | 7.10 |  |  | 3.2 |  | 0.2 |
The total pre-tax intrinsic value of HMCH options exercised during fiscal 2016 was $0.1 million. The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value, based on the HMCH market price, less the strike price, as of the end of the period presented, which would have been received by the option holders had all option holders exercised in-the-money options as of that date.

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