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Debt (Tables)
6 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Rates applicable to revolving credit facility
At September 30, 2013 and March 31, 2013, there were no outstanding borrowings under the revolving credit facility and, based on the Company's credit ratings, the rates applicable to the facility at September 30, 2013 and March 31, 2013 were as follows:
  
September 30, 2013
 
March 31, 2013
Applicable margin on Base Rate borrowing
0.125
%
 
0.250
%
Weighted average interest rate on outstanding borrowings
%
 
%
Applicable margin on Eurocurrency Rate borrowing
1.000
%
 
1.100
%
Facility commitment fee
0.125
%
 
0.150
%