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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Jun. 30, 2011
Bank
Mar. 31, 2012
Mar. 31, 1995
acre
Mar. 26, 2011
Long Term Debt (Textual) [Abstract]        
London Interbank Offered Rate (LIBOR)   0.24%    
Revolving credit facility agreement term 5 years      
Revolving credit facility agreement $ 175      
Revolving credit facility agreement, number of participating banks 7      
Provision allowing to expand the amount of overall facility 75      
Revolving credit facility agreement committed sum outstanding   5.0    
Line of credit sub-facility for issuing standby letters of credit   40    
Percentage of face amount of standby letter of credit payable as fees   1.125%    
Letters of credit outstanding   18.0    
Carrying amount of long-term debt (including current portion)   5.7   10.7
Fair value of long-term debt (including current portion)   5.6   10.7
The total amount financed for properties with capital leases   49.4    
Acres of land purchased     12.7  
Amount of land purchased     $ 0.7  
Percentage of land purchased via a non-interest mortgage     100.00%  
Period of non-interest bearing mortgage     20 years