Supplemental Cash Flow Information Non Cash Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Supplemental Cash Flow Information [Abstract]
Issuance Of Common Stock Under EPSRS Plan	$ 0.0	$ 3.9	$ 0.0