CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED BALANCE SHEETS
Software, accumulated amortization (in dollars)	$ 235,491	$ 227,280
Purchased software licenses, accumulated amortization (in dollars)	$ 262,169	$ 276,692
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized shares	200	200
Common stock, issued shares	121.3	120.0
Treasury stock, shares	47.8	43.2