Business Combinations: (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Apr. 19, 2016	Oct. 29, 2016	Oct. 29, 2016	Oct. 31, 2015
Business Acquisition [Line Items]
Acquisitions, net of cash acquired			$ 91,960	$ 0
Southern Tide
Business Acquisition [Line Items]
Purchase price	$ 85,000
Acquisitions, net of cash acquired		$ 92,000
Cash acquired	2,423
Selling, General and Administrative Expenses | Southern Tide
Business Acquisition [Line Items]
Transaction costs	$ 800