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Earnings Per Share (Details Textuals)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 25, 2011
Nov. 26, 2010
Nov. 25, 2011
Nov. 26, 2010
Earnings Per Share (Textuals) [Abstract]        
Stock option excluded from Earnings per share Computation 3.7 4.0 2.4 3.2
Common shares - Class A [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period upon exercise of stock option   0.1 0.7 0.9
Common shares - Class B [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period upon exercise of stock option     0.3 0.2