Shareholders' Equity (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Oct. 02, 2018
Equity, Class of Treasury Stock
Stock Repurchased During Period, Shares	1,429,154	0
Stock Repurchase Program, Authorized Amount	$ 100.0		$ 200.0
Stock Repurchased During Period, Value	107.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 93.0
Stock Issued During Period, Shares, Treasury Stock Reissued		2,785,402