Self-Insurance (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2015
Workers' compensation [Member]
Self-Insurance [Line Items]
Self-insurance policy retention per claim ($1 or less for workers' compensation, and $3 or less for general policies)	$ 1
Workers' compensation policy limit	no policy limits
General liability [Member]
Self-Insurance [Line Items]
Self-insurance policy retention per claim ($1 or less for workers' compensation, and $3 or less for general policies)	3
General liability [Member] | Employment practices liability [Member]
Self-Insurance [Line Items]
Self-insurance policy limit, maximum	30
General liability [Member] | Commercial General Liability [Member]
Self-Insurance [Line Items]
Self-insurance policy limit, maximum	$ 150