Supplemental Cash Flow Information Non Cash Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Supplemental Cash Flow Information [Abstract]
Accrued capital expenditures	$ 10.7	$ 8.2	$ 8.2
Issuance of Common Stock under the Employee Profit Sharing and Retirement Savings Plan	$ 0.0	$ 0.0	$ 3.9