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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Feb. 24, 2013
Accounting Policies [Abstract]  
Income tax expense (benefit) on components of other comprehensive income
The following details the income tax expense (benefit) on components of other comprehensive income:
 
 
Thirteen weeks ended
 
Thirty-nine weeks ended
 
February 24,
2013
 
February 26,
2012
 
February 24,
2013
 
February 26,
2012
Net derivative adjustment
$
19.1

 
$
6.7

 
$
17.4

 
$
(40.6
)
Unrealized gains on available-for-sale securities
0.1

 
0.1

 
0.1

 
—

Pension and postretirement healthcare liabilities
(1.8
)
 
(0.3
)
 
(1.2
)
 
10.5

 
$
17.4

 
$
6.5

 
$
16.3

 
$
(30.1
)