Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity Incentive Plan - Valuation Assumptions (Details)	Mar. 01, 2018	Mar. 01, 2017	Jan. 28, 2016	Jun. 01, 2015	Jan. 30, 2015
Performance-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, percentage					29.00%
Dividend Yield, percentage					0.00%
Risk Free Interest Rate, percentage					0.84%
Outperformance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, percentage				26.00%
Dividend Yield, percentage				4.50%
Risk Free Interest Rate, percentage				0.95%
Discount, percentage				0.00%
Long Term Incentive Plan Units, Time-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, percentage	26.00%	24.00%	28.00%
Dividend Yield, percentage	0.00%	0.00%	0.00%
Risk Free Interest Rate, percentage	2.07%	0.92%	0.79%
Discount, percentage	7.50%	7.50%	7.50%
Long Term Incentive Plan Units, Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, percentage	26.00%	25.00%	30.00%
Dividend Yield, percentage	6.20%	5.80%	5.80%
Risk Free Interest Rate, percentage	2.37%	1.47%	1.13%
Discount, percentage	0.00%	0.00%	0.00%