Quarterly report pursuant to Section 13 or 15(d)

Derivative and Other Comprehensive Income (Details)

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Derivative and Other Comprehensive Income (Details) (Variable-to-fixed interest rate swap agreement, USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended 1 Months Ended
Jul. 08, 2012
Rabobank
item
Dec. 25, 2011
Rabobank
Aug. 31, 2011
Rabobank
Mar. 31, 2011
SunTrust Bank, National Association
Mar. 31, 2010
SunTrust Bank, National Association
Mar. 31, 2008
SunTrust Bank, National Association
Maximum
Derivative and Other Comprehensive Income            
Number of derivative instruments held 1          
Notional amount of derivatives $ 69.8   $ 74.1      
Notional amount of derivatives expired 3.3 0.9   70.0 50.0  
Estimated notional hedge amount on expiration date which is June 30, 2015 50.6          
Fixed rate of interest on derivative (as a percent) 1.135%          
Reference rate for variable rate received on interest rate derivative 3-month spot LIBOR          
Amount of debt hedged           $ 120