Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012		Dec. 31, 2011
Income Tax [Line Items]
Effective income tax rate	31.00%		30.00%		31.00%		41.00%
Federal statutory income tax rate					35.00%		35.00%
Non-deductible portion of charge for European Commission fine							$ 40,000
Charge for European Commission fine and interest in Italy	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 49,091	[1]
Excluding Impact of Charge for European Commission Fine [Member]
Income Tax [Line Items]
Effective income tax rate							29.00%

[1] Item is not included in segment operating income, but is included in consolidated operating income.