Business And Summary Of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jan. 31, 2014
Accounting Policies [Abstract]
Restatement and remediation related expenses (Note 1)	$ 5,378,000	$ 10,963,000	$ 17,614,000	$ 13,986,000
Accounts receivable sold	333,800,000		333,800,000		263,700,000
Discount fees on sale of accounts receivable	$ 1,400,000	$ 700,000	$ 2,700,000	$ 1,400,000