Stock Compensation Plans and Capital Stock Transactions - Employee Stock Purchase Plan (Narrative) (Details) - Employee Stock shares in Thousands, $ in Millions	12 Months Ended
	Jan. 28, 2017 USD ($) offering_period shares	Jan. 30, 2016 shares	Jan. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of offering periods under the ESPP | offering_period	2
Percentage of the value of stock employees can purchase at	85.00%
Shares purchased under the ESPP (in shares) | shares	191	174	180
Cash received from purchases under ESPP | $	$ 2.1