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Share-Based Compensation (Tables)
 12 Months Ended
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

 
________________________
(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
%
 
________________________
(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