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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Jun. 01, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative translation adjustments at beginning of year $ (14.0) $ (13.0)  
Translation adjustments (0.7) 2.8  
Balance at end of period (14.7) (10.2)  
Pension and other post-retirement benefit plans at beginning of year (110.3) (127.6)  
Adjustments to pension and other post-retirement benefit plans 0.3 0.6  
Balance at end of period (108.9) (126.0)  
Total accumulated other comprehensive loss (123.6) (136.2) (124.3)
Cost of Sales [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification Adjustment from AOCI, Pension and Other Postretirement Plans, Tax 0.3 0.5  
Reclassification Adjustment from AOCI, Pension and Other Postretirement Plans, Net of Tax 0.5 1.0  
Operating Expense [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification Adjustment from AOCI, Pension and Other Postretirement Plans, Tax 0.8 0.7  
Reclassification Adjustment from AOCI, Pension and Other Postretirement Plans, Net of Tax $ 1.2 $ 1.2