Business And Summary Of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Jan. 31, 2013
Accounting Policies [Abstract]
Accounts receivable sold	$ 208.3		$ 208.3		$ 284.7
Discount fees on sale of accounts receivable	$ 0.7	$ 0.5	$ 1.4	$ 0.9