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Subsequent Events (Details) (Subsequent event, Construction Agreement, USD $)
In Millions, unless otherwise specified
 9 Months Ended
Dec. 31, 2012
Dec. 30, 2012
Distribution facility building, Olive Branch, Mississippi
sqft
Dec. 30, 2012
Distribution facility land, Olive Branch, Mississippi
acre
Dec. 31, 2012
Distribution facility building, Southaven, Mississippi
sqft
SUBSEQUENT EVENTS        
Area (in square feet or acres)   1,300,000 84 1,200,000
Total project cost after certain state grants and sale tax exemptions $ 37.00