Income Taxes	6 Months Ended
Sep. 30, 2011
Income Taxes [Abstract]
Income Taxes	(5) Income Taxes Income tax expense was $41.5 million and $59.3 million for the quarter and six months ended September 30, 2011, respectively, resulting in effective tax rates of 26.6% and 22.0%, respectively. Income tax expense was $12.0 million and $21.8 million for the quarter and six months ended September 30, 2010, respectively, resulting in effective tax rates of 8.3% and 8.8%, respectively. Our effective tax rate generally differs from the U.S. federal statutory rate of 35% due to favorable tax rates associated with earnings from lower tax rate jurisdictions throughout the world and our policy of indefinitely reinvesting earnings from certain jurisdictions (primarily in Europe), as well as due to additional accruals, changes in estimates, releases and settlements with taxing authorities related to our uncertain tax positions and benefits associated with income attributable to both domestic production activities and the extraterritorial income exclusion. During the quarter and six months ended September 30, 2011, the overall favorable effects of foreign tax rates on our effective tax rate were 6.7% and 8.9% of pre-tax earnings, respectively. During the quarter and six months ended September 30, 2010, the overall favorable effects of foreign tax rates on our effective tax rate were 13.3% and 12.2% of pre-tax earnings, respectively. During the six months ended September 30, 2011, we also recorded discrete net tax benefits of $6.2 million associated with tax authority settlements related to prior years’ tax matters which favorably impacted our effective tax rate by 2.3% of pre-tax earnings. During the quarter and six months ended September 30, 2010, we also recorded discrete net tax benefits of $18.0 million and $32.0 million, respectively, associated with tax authority settlements related to prior years’ tax matters which favorably impacted our effective tax rate by 12.5% and 13.0% of pre-tax earnings, respectively. Our effective tax rate could fluctuate on a quarterly basis and could be adversely affected to the extent earnings are lower than anticipated in countries with lower statutory rates and higher than anticipated in countries with higher statutory rates. We file a federal income tax return in the United States as well as income tax returns in various local, state and foreign jurisdictions. Our tax years are closed with the United States Internal Revenue Service (IRS) through the tax year ended March 31, 2005. The IRS has completed the audit of our tax years ended March 31, 2006, 2007 and 2008 and all issues except one related to the year ended March 31, 2006 have been resolved. We received a Notice of Deficiency from the IRS related to this issue and in July 2011 filed a petition for hearing with the U.S. Tax Court. The IRS has initiated an examination of our federal income tax return for the years ended March 31, 2009 and 2010. In addition, certain tax years related to local, state and foreign jurisdictions remain subject to examination. To provide for potential tax exposures, we maintain a liability for unrecognized tax benefits which we believe is adequate.

Income Taxes

6 Months Ended

Sep. 30, 2011

(5) Income Taxes

Income tax expense was $41.5 million and $59.3 million for the quarter and six months ended September 30, 2011, respectively, resulting in effective tax rates of 26.6% and 22.0%, respectively. Income tax expense was $12.0 million and $21.8 million for the quarter and six months ended September 30, 2010, respectively, resulting in effective tax rates of 8.3% and 8.8%, respectively. Our effective tax rate generally differs from the U.S. federal statutory rate of 35% due to favorable tax rates associated with earnings from lower tax rate jurisdictions throughout the world and our policy of indefinitely reinvesting earnings from certain jurisdictions (primarily in Europe), as well as due to additional accruals, changes in estimates, releases and settlements with taxing authorities related to our uncertain tax positions and benefits associated with income attributable to both domestic production activities and the extraterritorial income exclusion. During the quarter and six months ended September 30, 2011, the overall favorable effects of foreign tax rates on our effective tax rate were 6.7% and 8.9% of pre-tax earnings, respectively. During the quarter and six months ended September 30, 2010, the overall favorable effects of foreign tax rates on our effective tax rate were 13.3% and 12.2% of pre-tax earnings, respectively. During the six months ended September 30, 2011, we also recorded discrete net tax benefits of $6.2 million associated with tax authority settlements related to prior years’ tax matters which favorably impacted our effective tax rate by 2.3% of pre-tax earnings. During the quarter and six months ended September 30, 2010, we also recorded discrete net tax benefits of $18.0 million and $32.0 million, respectively, associated with tax authority settlements related to prior years’ tax matters which favorably impacted our effective tax rate by 12.5% and 13.0% of pre-tax earnings, respectively. Our effective tax rate could fluctuate on a quarterly basis and could be adversely affected to the extent earnings are lower than anticipated in countries with lower statutory rates and higher than anticipated in countries with higher statutory rates.

We file a federal income tax return in the United States as well as income tax returns in various local, state and foreign jurisdictions. Our tax years are closed with the United States Internal Revenue Service (IRS) through the tax year ended March 31, 2005. The IRS has completed the audit of our tax years ended March 31, 2006, 2007 and 2008 and all issues except one related to the year ended March 31, 2006 have been resolved. We received a Notice of Deficiency from the IRS related to this issue and in July 2011 filed a petition for hearing with the U.S. Tax Court. The IRS has initiated an examination of our federal income tax return for the years ended March 31, 2009 and 2010. In addition, certain tax years related to local, state and foreign jurisdictions remain subject to examination. To provide for potential tax exposures, we maintain a liability for unrecognized tax benefits which we believe is adequate.