Business and Summary of Significant Accounting Policies Other Intangible Assets and Related Accumulated Amortization (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Developed technologies, in-process research and development technology, indefinite lived	$ 1.2	$ 0