Employee Benefit and Stock Compensation Plans Stock Options (Details) - Award Type [Domain] - $ / shares		12 Months Ended
		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	[1]	3,029	4,029	5,362	7,362
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price		$ 246.18	$ 258.16	$ 255.17	$ 235.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	[1]	0	0	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 0	$ 0.00	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	[1]	0	0	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 0	$ 0	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	[1]	1,000	1,333	2,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price		$ 294.45	$ 246.2	$ 180.90
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	[1]	3,002	3,975	5,229

[1] Options for all periods presented reflects a 1-for-15 reverse stock split which was effective on October 27, 2011