Capital Stock Schedule of Common Stock Shares (Details) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]
Common Stock, Shares, Outstanding	107,012	111,469	117,173	125,341
Stock Issued During Period, Shares, Share-based Compensation, Gross	338	718	781
Stock Issued During Period, Shares, Employee Benefit Plan	12	44	50
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	142	938	1,233
Stock Repurchased and Retired During Period, Shares	(4,537)	(6,931)	(9,677)
Shares Paid for Tax Withholding for Share Based Compensation	(412)	(473)	(555)