Summary of Significant Accounting Policies (Restricted Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	May 05, 2018	Feb. 03, 2018	Apr. 29, 2017
Accounting Policies [Abstract]
Prepaid expenses and other	$ 2,822	$ 2,435	$ 699
Other long-term assets	0	403	2,902
Total restricted investments	$ 2,822	$ 2,838	$ 3,601

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