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PENSION AND POSTRETIREMENT BENEFITS (Tables)
 3 Months Ended
Aug. 28, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of Pension Benefit and Other Postretirement Benefit Costs
Components of pension benefit and other postretirement benefit costs are (includes amounts related to discontinued operations):
 
Pension Benefits
 
Thirteen weeks ended
 
August 28,
2016
 
August 30,
2015
Service cost
$
16.7

 
$
23.8

Interest cost
30.0

 
41.0

Expected return on plan assets
(53.8
)
 
(66.9
)
Amortization of prior service cost
0.6

 
0.7

Benefit cost — Company plans
(6.5
)
 
(1.4
)
Pension benefit cost — multi-employer plans
2.3

 
2.3

Total benefit cost (benefit)
$
(4.2
)
 
$
0.9

 
Postretirement Benefits
 
Thirteen weeks ended
 
August 28,
2016
 
August 30,
2015
Service cost
$
—

 
$
0.1

Interest cost
1.1

 
2.0

Amortization of prior service benefit
(1.7
)
 
(2.0
)
Recognized net actuarial loss
0.1

 
—

Total cost (benefit)
$
(0.5
)
 
$
0.1