Significant Accounting Policies Significant accounting policies Accounting changes (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jan. 28, 2017	Jan. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	$ (56,955)	$ (90,602)
Net increase in cash, cash equivalents, and restricted cash	34,174	26,060
Cash and cash equivalents	149,485	60,962	$ 110,657
Restricted Cash and Cash Equivalents, Current	0	5,269	4,654
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 149,485	66,231	$ 115,311
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		110,635
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		8,310
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(90,478)
Net increase in cash, cash equivalents, and restricted cash		28,467
Cash and cash equivalents		60,962		$ 32,495
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		110,759
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		5,903
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(90,602)
Net increase in cash, cash equivalents, and restricted cash		26,060
Restricted Cash and Cash Equivalents, Current		5,269		7,676
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		66,231		$ 40,171
Adjustments for New Accounting Pronouncement [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities		(124)
Increase (Decrease) in Restricted Cash		$ (2,407)