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Share-Based Compensation (Tables) | 12 Months Ended
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Feb. 23, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share Based Payment Award Outstanding Awards [Table Text Block] | Share-based awards currently outstanding under the Incentive Compensation Plan are as follows:
Total Outstanding Awards | February 23, 2018
Performance units (1) | 688,600 |  |
Restricted stock units | 1,789,775 |  |
Total outstanding awards | 2,478,375 |  |
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(1) | This amount includes the maximum number of shares that may be issued under outstanding performance unit awards; however, the actual number of shares which may be issued will be determined based on the satisfaction of certain criteria, and therefore may be significantly lower.
Performance Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Share Based Payment Award Performance Units Valuation Assumptions [Table Text Block] | The Monte Carlo simulation was computed using the following assumptions:
| 2018 Awards | 2017 Awards | 2016 Awards
Three-year risk-free interest rate (1) | 1.4 | % |  | 0.9 | % |  | 0.8 | % |
Expected term | 3 years |  |  | 3 years |  |  | 3 years |  |
Estimated volatility (2) | 31.8 | % |  | 31.2 | % |  | 29.4 | % |
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(1) | Based on the U.S. Government bond benchmark on the grant date.
(2) | Represents the historical price volatility of our Company’s Class A Common Stock for the three-year period preceding the grant date.
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The total performance units expense and associated tax benefit in 2018, 2017 and 2016 was as follows:
Performance Units | Year Ended
February 23, 2018 | February 24, 2017 | February 26, 2016
Expense | $ | 5.0 |  |  | $ | 5.6 |  |  | $ | 7.4 |  |
Tax benefit | 1.7 |  |  | 2.0 |  |  | 2.7 |  |
Schedule Of Share Based Compensation Performance Units Award Activity [Table Text Block] | The 2018 activity for performance units is as follows:
Maximum Number of Nonvested Units | Total | Weighted-Average Grant Date Fair Value per Unit
Nonvested as of February 24, 2017 | 916,420 |  |  | $ | 19.31 |  |
Granted | 309,000 |  |  | 21.76 |  |
Vested | (536,820 | ) |  | 21.42 |  |
Nonvested as of February 23, 2018 | 688,600 |  |  | 18.77 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] | The Monte Carlo simulation resulted in the following weighted-average grant date fair values per TSR PSU:
Grant Date Fair Value per TSR PSU | Year Ended
February 23, 2018 | February 24, 2017 | February 26, 2016
Weighted-average grant date fair value per share of TSR PSUs granted during 2018, 2017 and 2016 | $ | 21.76 |  |  | $ | 16.33 |  |  | $ | 24.15 |  |
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The total RSUs expense and associated tax benefit in 2018, 2017 and 2016 is as follows:
Restricted Stock Units | Year Ended
February 23, 2018 | February 24, 2017 | February 26, 2016
Expense | $ | 13.4 |  |  | $ | 13.5 |  |  | $ | 12.9 |  |
Tax benefit | 4.5 |  |  | 4.9 |  |  | 4.6 |  |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The 2018 activity for RSUs is as follows:
Nonvested Units | Total | Weighted-Average Grant Date Fair Value per Share
Nonvested as of February 24, 2017 | 1,731,507 |  |  | $ | 16.38 |  |
Granted | 780,321 |  |  | 16.51 |  |
Vested | (688,965 | ) |  | 18.17 |  |
Forfeited | (33,088 | ) |  | 16.14 |  |
Nonvested as of February 23, 2018 | 1,789,775 |  |  | 15.75 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] | The weighted-average grant date fair value per share of RSUs granted in 2018, 2017 and 2016 is as follows:
Grant Date Fair Value per Share | Year Ended
February 23, 2018 | February 24, 2017 | February 26, 2016
Weighted-average grant date fair value per share of RSUs granted | $ | 16.51 |  |  | $ | 14.66 |  |  | $ | 18.82 |  |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for performance units that were outstanding at the beginning and end of the year, and the number of performance units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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