CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
CONSOLIDATED BALANCE SHEETS
Software, accumulated amortization (in dollars)	$ 227,280	$ 214,713
Purchased software licenses, accumulated amortization (in dollars)	$ 276,692	$ 257,029
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized shares	200	200
Common stock, issued shares	120.0	117.8
Treasury stock, shares	43.2	37.2