Summary of Significant Accounting Policies (Restricted Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Aug. 04, 2018	Feb. 03, 2018	Jul. 29, 2017
Accounting Policies [Abstract]
Prepaid expenses and other	$ 2,812	$ 2,435	$ 693
Other long-term assets	0	403	2,884
Total restricted investments	$ 2,812	$ 2,838	$ 3,577

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

No definition available.

Name:	us-gaap_RestrictedInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant