Basis of Presentation (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012	Mar. 31, 2011
Note 1 Number of Weeks [Abstract]
Number of Weeks in Fiscal Year					P52W	P52W
Quarter To Date Number Of Weeks In Fiscal Quarter	P13W	P13W
Year To Date Number Of Weeks In Fiscal Quarter			P39W	P39W