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PENSION AND POSTRETIREMENT BENEFITS (Tables)
 3 Months Ended
Aug. 27, 2017
Retirement Benefits [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 27,
2017
 
August 28,
2016
Service cost
$
12.7

 
$
16.7

Interest cost
28.2

 
30.0

Expected return on plan assets
(54.2
)
 
(53.8
)
Amortization of prior service cost
0.7

 
0.6

Benefit cost (benefit) — Company plans
(12.6
)
 
(6.5
)
Pension benefit cost — multi-employer plans
1.5

 
2.3

Total benefit cost (benefit)
$
(11.1
)
 
$
(4.2
)
 
Postretirement Benefits
 
Thirteen Weeks Ended
 
August 27,
2017
 
August 28,
2016
Service cost
$
—

 
$
—

Interest cost
0.9

 
1.1

Amortization of prior service benefit
(0.8
)
 
(1.7
)
Recognized net actuarial loss
—

 
0.1

Total cost (benefit)
$
0.1

 
$
(0.5
)