Stock-Based Compensation (Details 2) (Stock options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock options
Stock based compensation disclosure
Options outstanding, beginning of period (in shares)	5,624	5,419	6,054
Granted (in shares)	966	810	729
Exercised (in shares)	(25)	(117)	(634)
Canceled/forfeited (in shares)	(1,204)	(488)	(730)
Options outstanding, end of period (in shares)	5,361	5,624	5,419
Options outstanding (in dollars per share), beginning of period	$ 57.78	$ 59.82	$ 57.75
Granted (in dollars per share)	$ 23.72	$ 33.99	$ 33.12
Exercised (in dollars per share)	$ 21.80	$ 25.32	$ 21.85
Canceled/forfeited (in dollars per share)	$ 51.87	$ 48.80	$ 48.94
Options outstanding (in dollars per share), end of period	$ 53.13	$ 57.78	$ 59.82
Total intrinsic value of exercised shares	$ 168	$ 398	$ 6,977
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 12,649