Stock-Based Compensation (Details 5) (Stock options, USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock options
Share-based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions
Weighted-average grant date fair value, granted (in dollars per share)	$ 9.47	$ 13.13	$ 14.32
Expected dividend yield (as a percent)	1.44%	1.39%	1.39%
Risk-free interest rate (as a percent)	0.81%	1.95%	2.37%
Expected volatility (as a percent)	51.80%	47.16%	52.64%
Expected lives	5 years 7 days	5 years 44 days	5 years 66 days