Business And Summary Of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016
Accounting Policies [Abstract]
Gain (Loss) Related to Litigation Settlement	$ 443	$ 38,511
Accounts receivable sold	430,600		$ 554,200
Discount fees on sale of accounts receivable	$ 1,200	$ 1,000